Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b9a9e33098a779…

MALICIOUS

PDF

78.2 KB Created: 2021-04-08 00:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c99de5096535f769ac31470c21b72c68 SHA-1: 53c6d2cbac5d0961c9030372174f229001a4ed27 SHA-256: 22b9a9e33098a7796fece31425c434962b9a4f92ee42eed915979f61d50e50df
186 Risk Score

Malware Insights

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

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 0.9996

Heuristics 6

  • 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 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://lozipotod.ru/123?utm_term=whirlpool+stackable+washer+dryer+front+load+manual PDF link annotation
    • http://optamorem.com/the_queen_of_the_tearling_trilogyy4b82.pdfIn PDF document text
    • http://yesnutural.space/xudekusuwevifenudufogotaoyfq5.pdfIn PDF document text
    • http://chebsvet.ru/jasixajarimomojaxi10aif.pdfIn PDF document text
    • http://natfreshik.fun/depexoxoxataxosoramofewotv1i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449417/normal_605c4f4ae5d23.pdfIn PDF document text
    • http://shoop-fo.ru/zilusobqtz00.pdfIn PDF document text
    • http://ndfnasg.xyz/zodotawokiregemuojs82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486374/normal_5fc7fe9cba271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465543/normal_5ff70d0e6aedf.pdfIn PDF document text
    • http://shoes-storie.club/wuzuvelejekapirowzvfle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_602e56026954c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_a8165a97305c4254afa03c0452035d63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutasujal/commas_in_a_series_worksheet_7th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/hollywood_s_bleeding_lyrics.pdfIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_2142c8697573432b85c46ff556e442db.pdf?index=trueIn PDF document text
    • https://712e085e-8422-4094-ae2e-709d430f1fc9.filesusr.com/ugd/bf8edb_5eefd36cf2534b35a75a615662283ed3.pdf?index=trueIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_c08f92baf5dc4bd8b5a7b24dba873ef9.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_aab16d0169c447549cd7123ea9fa469e.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_81de0ce44a4d481a89c4dbbe6793e98a.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_4f1f6203b0db4c2982e1e8d5379c8092.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/fisher_paykel_dishwasher_manual_dw60csx1.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_6b1afb69f8bf4c15824280a327573954.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_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 5808 bytes
SHA-256: 934ae99b3eff220cd3239ff93f25510342538fd61d51d8775b37f86073e57cb9
font_01_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 10540 bytes
SHA-256: 4c19643de0a069018c596fcdf1e19e11c87c5d8777f20998ca1c834a1ebd483f