Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9188a73710d4f2…

MALICIOUS

PDF

64.3 KB Created: 2020-11-17 09:06:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 018823eaed32bc720262d8d8a258e745 SHA-1: 937de1dd08e291e16062cce0f76bbe1d525c1fae SHA-256: 4a9188a73710d4f2471488d9dbb53e075749692f251a6056c1dc4cd0b8b25a49
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external, potentially harmful, 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
  • 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://traffmen.ru/123?utm_term=how+to+make+bed+in+minecraft+in+hindi In PDF document text
    • https://kanamatadu.weebly.com/uploads/1/3/4/3/134366206/cbe55f.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/2736922.pdfIn PDF document text
    • https://bujugumaxu.weebly.com/uploads/1/3/4/0/134096797/5127526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_5fad289089fac.pdfIn PDF document text
    • https://rizenorugeworo.weebly.com/uploads/1/3/4/3/134379336/3165700.pdfIn PDF document text
    • https://nubawobadeg.weebly.com/uploads/1/3/4/1/134131997/2143049.pdfIn PDF document text
    • https://jolezutixuzusav.weebly.com/uploads/1/3/4/6/134605000/lufowazudeki.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/gakojobetakap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_5fa47cab738e1.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/4c2cb17da89382.pdfIn PDF document text
    • https://degitigurot.weebly.com/uploads/1/3/4/3/134337886/getenene_nirelujidup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/39aed3b0-e5d8-4d96-8036-ba5df274342a/gangnam_style_lyrics_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ed6ada-ba0d-4534-b8c0-3fc0d964b28a/7212166095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a042c476-43e0-456d-87d4-3855faf1f57a/63925826149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a387992e-10bd-4fc1-9ad9-d24878b0296f/84198429902.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29D 5096 bytes
SHA-256: 83ecc9bd68e0921f5b6d48355bfeb1725f4fae7c89fd85c0d961a89d0f3d936f
font_01_sfnt_off0000c3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CA 10048 bytes
SHA-256: 5b32b9f5a796f84c1ba7b91254d03fc62c647198e5cdf3da4f530ea315b0a0fb
font_02_sfnt_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71