Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1f8a1f4c83fda7…

MALICIOUS

PDF

89.2 KB Created: 2021-01-26 18:40:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1e2a7b189b20ab7349e1bc482524f3a3 SHA-1: 53f1a40b10b39229df591dac624861dfc108f7cc SHA-256: dd1f8a1f4c83fda77a418f672eff6f433e558e1eb6aeda8f9df0efae38a9b17a
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 pointing to disposable domains and Weebly hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to lure users to malicious content, potentially leveraging embedded JavaScript for exploitation.

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://baarspo.ru/aws?utm_term=a+n+college+patna+admission+form+2019 PDF link annotation
    • https://cdn.sqhk.co/dogutadova/gfjf8HD/tiny_alien_mib.pdfIn PDF document text
    • https://vedudogekikusiw.weebly.com/uploads/1/3/1/1/131164168/8eac8d67.pdfIn PDF document text
    • http://nat-yoga.space/xuzetujezetadumejodosuteztrar.pdfIn PDF document text
    • https://negogesi.weebly.com/uploads/1/3/0/7/130739616/2ffc46a4493359.pdfIn PDF document text
    • http://rerubin.space/47891833339scbjg.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/pawalirifibodidemu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5fe3327a3a74d.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/thbgc90/98723222431.pdfIn PDF document text
    • http://sportita.fun/48138997166x36rj.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/3iEedqY/30710660018.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/bihhggj/birthday_room_decoration_ideas_for_mom.pdfIn PDF document text
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/lezogedorajuv_vuxota_lamulasusitoti_jiperazut.pdfIn PDF document text
    • https://jikurufor.weebly.com/uploads/1/3/4/6/134613562/6040181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5fd5f5ef9e938.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/pejufonaguxozan.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_off00011f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6B 5948 bytes
SHA-256: 58abc068391f36578ac4485e604a8c9a798d9ed9c1f29a38ca61364749de3c32
font_01_sfnt_off00013393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13393 10536 bytes
SHA-256: afada52acb7230f7371b2b31b13b0ff7c3b1efc53e84df0adef58cb958fee6b4

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