Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7771b5d7e0d7e9…

MALICIOUS

PDF

81.4 KB Created: 2021-04-12 21:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8e3ae247e4ffc1051bb16b33bb1e5a04 SHA-1: 1cd4ea2bbb2964ee0bef34e5c22370a559122486 SHA-256: ee7771b5d7e0d7e9b0c59796c9cf28c0b3c1d0e05f066bcc533797222bffbd47
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://leonvi.ru/strik?utm_term=family+tree+template+microsoft+word+2007 PDF link annotation
    • https://cdn.sqhk.co/zatovafer/gcieOEw/gekuzapigelekadoliv.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/RjfD1rM/hungry_shark_world_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/pQibMAl/i_wish_you_were_mine_quotes_for_her.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/kibaladazipud.pdfIn PDF document text
    • http://wuroguredogir.getenjoyment.net/34944340338.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/wifone.pdfIn PDF document text
    • https://cdn.sqhk.co/berazanoga/idX6NGe/nubotagume.pdfIn PDF document text
    • http://seweripuwas.mywebcommunity.org/popajevazaperi.pdfIn PDF document text
    • http://bonozowibewoz.mypressonline.com/animal_4d_cards_free_download.pdfIn PDF document text
    • http://boketizabujig.scienceontheweb.net/nevijigani.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/diahgha/fasunibaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/giaihih/nulebubabutulerazidukul.pdfIn PDF document text
    • https://cdn.sqhk.co/wupofolizaj/jahiher/ant_simons_contract.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/21000514133.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/cUWgh3y/98507844341.pdfIn PDF document text
    • https://cdn.sqhk.co/baveninale/hiAUdgf/nevimejukar.pdfIn PDF document text
    • http://mujododaziwato.scienceontheweb.net/sutavaxuramezoviko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_f4b6f6730731486f9fc854ebe274ee78.pdf?index=trueIn PDF document text
    • https://a19d597f-2220-41b3-9459-688249e8a20b.filesusr.com/ugd/f19f53_b6200f6db1a948f1979c2b54d36aa440.pdf?index=trueIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_4f6d32c9368643aea845f837f305a231.pdf?index=trueIn PDF document text
    • http://rorokepu.atwebpages.com/que_es_psicologia_laboral.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_d177a91ae43b44dab5f6932681564b9b.pdf?index=trueIn PDF document text
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_3322a6e28a6e434c9d032d416dd30517.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_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 5804 bytes
SHA-256: 83a82ecaa10162aa5b90c2ae824efd5167fc6d4b6b450d3b3613d6cab395af07
font_01_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 10356 bytes
SHA-256: 164c53fea868aeb6332009ff3905d080d4d92a44b94ed2d81db684190d6be1ec