Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd88add2b96d0a35…

MALICIOUS

PDF

78.2 KB Created: 2021-03-26 07:26:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0a10cc109788f3ca56bcf7d4b6c5524c SHA-1: 119f2356c3811629cfa9a36cf7d593d8d0114294 SHA-256: dd88add2b96d0a3566bcdeb9de996426d95e750d6fcd6eddae148bfe8da5609e
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 significant number of external links, with heuristics identifying it as a link farm hosted on disposable domains. The embedded URL `https://bologen.ru/wix?keyword=ambum+stone+replica` and other Weebly-hosted PDFs suggest a phishing or content redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=ambum+stone+replica PDF link annotation
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/zugoboluxiwefok.pdfIn PDF document text
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/gojolupaledob.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/2867516.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1deb85-1d29-44e3-9acd-12811ee51302/english_classical_music_instrumental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f281d10-dea8-452c-99df-6f53cd0347cd/80188094550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5448e3f-63b8-4423-8b62-5b837debbe3d/what_batteries_do_nixon_watches_use.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/how_do_you_round_to_the_nearest_hundred_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee11191d-4e70-4fc1-b4c1-cac71fab4286/maxi_cosi_mico_ap_2.0_compatible_strollers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a74f96a-a6a4-4a64-8721-88679a633de9/89545078915.pdfIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_72a96447752d448093d3bbbd9b0e99f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobesogum/nimononobedavemeden.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_a4fefbf7d6604807a9282f8f645a53f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38fafa30-6418-4aa4-9ec4-9f1b90f152de/23570612307.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_a3580aa933f94df8b3bc86117054c4da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejobu/fibiwas.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_3b612bd66aab421ea6772741940189a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbafcc88-cd77-4cac-a297-2e94854b21aa/jutekiwatijimadulokibufir.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_6ea98791ecde43098e065562df01f63b.pdf?index=trueIn 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_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 5208 bytes
SHA-256: 3ffdd66e6e0db044f83c84a62d18ef558f7b889479b27223b8e71966c3bfb01f
font_01_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 10920 bytes
SHA-256: ff75999255929dbc8e321d1916b5714b27613a89b2a0d77f333fd9728857d708