Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a3c07df9b77375…

MALICIOUS

PDF

71.4 KB Created: 2021-04-01 04:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d0724e95faa26f3867dc9530fb306294 SHA-1: 03597a2d4d620285488f8aa33618da1e9288982b SHA-256: 60a3c07df9b77375f0b9cc6eb09ae5c9a884cb7056e2de1b8646ac84165143c3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of an SEO spam or link farm operation. The primary external URI points to a site that appears to be related to search keywords, further supporting this assessment. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/wix?keyword=human+footprint+movie+worksheet+answers PDF link annotation
    • http://ravanusos.iblogger.org/its_my_love_story_song_lyrics_in_telugu.pdfIn PDF document text
    • http://zowisofefo.iblogger.org/8321756128.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_f10cda7c4ea4497283956708d6386e3b.pdf?index=trueIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_44c9bb9d1d624a1a92f1b451aba098db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/216312aa-6273-4d74-822f-2705040eade8/yo_tengo_tu_love_letra_karaoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f45f8b5-7e0a-4176-b758-4526ffbc5c48/futirororomemubuv.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_0cb2c76938af4b66810d51cf39741742.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomogas/xotan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7eadefd-ed1b-42fc-a856-1b9854e00ba6/visexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7922434d-1011-40ed-84a3-b7b2872270f0/what_are_words_the_piano_guys_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e100f8-71cf-451d-8ba5-874eb5924460/85241528700.pdfIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_35218a26e1864c6c85b2b73ca83af942.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/205bde2c-b94e-49ec-9558-4202f8778d67/5505042878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f896e66-c1d7-4161-9500-74395055f4c8/luxpro_thermostat_locked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b551b32-58ea-4fa2-a373-fae5eb5b2a58/meade_lx200_sc10_f10_gps.pdfIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_934c95b56c7d410d9f0e4dcb5900f4fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejifavo/sozelif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c40d49-83ef-4a72-a3a9-53ffe16bd676/keurig_mini_plus_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41659a4d-580b-492b-bdf3-9aed1cd2a51d/how_to_use_lg_front_load_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/baojie_bj-_218_manual_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f1977ce-467d-4ac8-9c49-7882ac76de3b/47079801654.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/varazof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b2d5309-9c1d-49a9-a831-695d3e83887d/muscle_building_meal_plan_for_beginners.pdfIn PDF document text
    • http://duwimufowewis.epizy.com/satedudevarunomojas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a109788-c869-4ffc-b6f9-4a7492b0b0c5/dnd_5e_wolf_in_sheeps_clothing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/260cb209-f808-43d9-acc6-1d0649380a85/char_broil_2_burner_grill_wont_light.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 5288 bytes
SHA-256: ccfd76bf79770a66c1665282e29a6d6c9990c79c484588912dc243b13c9ebb6f
font_01_sfnt_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 10524 bytes
SHA-256: 3f9e199b5d9958438eaefdfcf8b629cc415a8c3d4d06f8033d691847e6269c12

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