Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c072ffb927fecf5…

MALICIOUS

PDF

82.9 KB Created: 2021-01-08 15:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a734ac0aa6fcee278bac991917d7d84d SHA-1: 718406e273cedbb39a60d7049e9d891244b11a50 SHA-256: 6c072ffb927fecf581cc36fdf40bd49498496984748511f2b12dc29c86a42f87
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=starbucks+caramel+brulee+latte+review PDF link annotation
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/039a42a.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/8045019.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/nolosejasawemafomiku.pdfIn PDF document text
    • https://ravidaxixow.weebly.com/uploads/1/3/4/3/134315840/vivegijafimob-zivinejuri-tegobaxunota-zigadopuj.pdfIn PDF document text
    • https://felekiki.weebly.com/uploads/1/3/4/6/134689652/17819f59e13d1.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/dd69d725d98b71.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/jugagapikaxepu.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/a861b513-265a-4aed-9544-05980e8165ae/zevorobodigimovijexuwawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dcc8a3e-bda9-41a3-8086-75e03032547c/lopigib.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/garbage_pickup_schedule_town_of_hempstead_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbbe7716-a503-44b0-bd6c-d45a7a00c3d4/5280900923.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/free_check_register_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/55280228172.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/16544784802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cfab673-9dc4-4852-b965-7e6be7377ba2/planeaciones_telesecundaria_tercer_g.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 5404 bytes
SHA-256: e2e3926196fe68b762f7d249b849f0c94489bd004100d0bc74d5bc60a6b9eb30
font_01_sfnt_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 11864 bytes
SHA-256: d43064dd0c1a8a1d5a32a086b403fc195533493aeff6d80c25ac52f982f6bc6b

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