Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36d9aaec0788910…

MALICIOUS

PDF

116.8 KB Created: 2021-03-28 16:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 11dcdfd7f98fad269a49b7bec21d7da1 SHA-1: 2295f01d50873921e09f36d43a39f3f67a68a092 SHA-256: f36d9aaec078891019ceb80516adbe5a49f0affc64d7a95302d7d99846ad7bfa
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. 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 0.9994

Heuristics 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://xajibur.ru/award?keyword=acer+predator+helios+300+manual+pdf PDF link annotation
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/gutekaletajulojowuti.pdfIn PDF document text
    • https://mokoxobijukox.weebly.com/uploads/1/3/4/3/134321678/3353254.pdfIn PDF document text
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/8234128.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/kofopokejiwazepebi.pdfIn PDF document text
    • https://rutisipileriruk.weebly.com/uploads/1/3/2/7/132740940/4521400.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/stata_ado_file_location0ff01.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/nowoseziji-fenadexozone-legirelig.pdfIn PDF document text
    • https://kisagisetiduke.weebly.com/uploads/1/3/4/7/134762251/fb2280.pdfIn PDF document text
    • https://rezolokad.weebly.com/uploads/1/3/4/7/134718373/wifevino_zuranowireda_tubozowutopetid.pdfIn PDF document text
    • http://smartcoin.design/how_to_use_a_hoover_agility_carpet_cleanerz06rn.pdfIn PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/vazatakib_dalosuwiragege_sodifatex_ronifiw.pdfIn PDF document text
    • http://hookup668.site/cyber_defence_training_and_education_platform0w23u.pdfIn PDF document text
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/lemafan-velakesesomev.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/6456daea6152e.pdfIn PDF document text
    • http://kengoru.space/vexit0rhsh.pdfIn PDF document text
    • http://abanca-electronica.com/64354894216zqgzr.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/a113a4789240d8.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/rijofazajito-nurawawaz.pdfIn PDF document text
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/fdcb8062e3375.pdfIn PDF document text
    • https://tudimase.weebly.com/uploads/1/3/5/9/135985307/d4b42664ee56f.pdfIn PDF document text
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/8588095.pdfIn PDF document text
    • http://replyua.site/75957719735d77rm.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/loxokiwawemuvep_namumubode_rewid_puzonupaxavoje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00018833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18833 5692 bytes
SHA-256: a17692e862ace48c8e492ab8fcbfee3c727322fd0175c09803fd70e589d8be1c
font_01_sfnt_off00019b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B6D 12888 bytes
SHA-256: ec69b2c8f092f5ee82a260a84064883a16464c870e09607e404e86c987f63c10