Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a22c7f479ccbf38…

MALICIOUS

PDF

61.9 KB Created: 2021-01-08 15:21:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ab5c4d73754552d5087332d2851cde47 SHA-1: e24f6a7b64c33ddf4c79519aa461f8f3389b439b SHA-256: 0a22c7f479ccbf38ed64842c745615c1cfd661528fdfe82d3c4b880224631c1e
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via link farms.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/aws?utm_term=gmail+app+android+notifications In PDF document text
    • https://sonojija.weebly.com/uploads/1/3/4/7/134723635/sifalodavubipar.pdfIn PDF document text
    • https://fewadagagex.weebly.com/uploads/1/3/4/5/134594838/juwifesikifosat.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/jasofumewu-dujararos-xokiratolo-setejasojod.pdfIn PDF document text
    • https://midonoguta.weebly.com/uploads/1/3/5/3/135347847/a2243d.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/3826228.pdfIn PDF document text
    • https://suzilevovovo.weebly.com/uploads/1/3/4/3/134310132/kofewadudujuxuxowir.pdfIn PDF document text
    • https://kagoxikefo.weebly.com/uploads/1/3/4/6/134649289/vixijuwem.pdfIn PDF document text
    • https://depuxozepol.weebly.com/uploads/1/3/4/3/134377374/lijevo.pdfIn PDF document text
    • https://rotowuvusokij.weebly.com/uploads/1/3/4/8/134884207/3183181.pdfIn PDF document text
    • https://zugixipenelir.weebly.com/uploads/1/3/4/5/134591811/jukituw.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/3bd63ecf-ac33-4746-b623-392d384b971e/usos_y_aplicaciones_de_los_hidruros.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/colorado_secretary_of_state_periodic_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/cartoon_picture_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d2385f-40e1-46dc-8361-e9385aaeca42/colossi_of_memnon_sound.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB973 5332 bytes
SHA-256: 8fa33d99d0889a5f21c9aaea7704d272945208161ce40ebc9ff0e4b15de5b1b9
font_01_sfnt_off0000cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 9172 bytes
SHA-256: 7dd85bfd10e4524072e9374b2e8bd93e38e60415d0b33dcab751151bad595cdc

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