Malicious PDF — malware analysis report

Static analysis result for SHA-256 f923e170b0de2a03…

MALICIOUS

PDF

95.2 KB Created: 2021-05-13 12:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5a7502d0d3a53072c77512eefbcdf705 SHA-1: e8caebce9ab47bce44fde11ee6144ce99579bc60 SHA-256: f923e170b0de2a03d0adbb6adf080fe356c8fab2a39906f825301735faad78e1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=what+is+a+mexican+girl%2527s+15th+birthday+called PDF link annotation
    • https://cdn.sqhk.co/puburasar/jihdJjd/sims_freeplay_vip_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_6027de1f3ee43.pdfIn PDF document text
    • http://derabaxudofofo.22web.org/google_maps_api_key_free_android.pdfIn PDF document text
    • https://cdn.sqhk.co/puruwedisuma/ghihvje/15713589242.pdfIn PDF document text
    • http://batizilojado.22web.org/vikuragixozovej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_5fd7c73aab43f.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/bjhkRV1/fun_car_racing_games_on_roblox.pdfIn PDF document text
    • http://menegatuje.iblogger.org/10024129753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470220/normal_5fe13eb525b4d.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/uNbjbsh/unique_thrift_store_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_5fd1bc8ddb68f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_602c2247892d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gebezivorubax.rf.gd/candidiasis_oral_en_lactantes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee6d8b5c-cbb5-4ba0-8350-6c63222164bc/pl_sql_developer_sql_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6add90-e41d-4de6-a672-328db1044b6e/what_new_books_are_coming_out_in_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be58899-134d-4d60-a083-c28eb914b780/frosty_the_snowman_christmas_journey_board_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d853ecf5-3272-47be-bd92-48e733c51b2e/51552928492.pdfIn PDF document text
    • http://tafisom.epizy.com/mercedes_benz_a_class_amg_line_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e53777-27db-4ecf-a156-107da07ca7d3/scarlett_2i4_problems_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42746827-ff37-4ce9-a990-8719bdf72dea/spell_of_the_sensuous_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a7bf0fe-2457-4109-824d-130ea9c4f0d4/ue_boom_speaker_sale_nz.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_off000130ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AB 5884 bytes
SHA-256: b69fa5eb077328f8d4693c15f7296bce6a43d7351e8f35e358c1efc653ec58a8
font_01_sfnt_off000144b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B0 13428 bytes
SHA-256: e3e93d697ac41c0886ad497cec71ad960976bb8ae8e510b8fd938a59d9c57546

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