Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabcf4dca601dea3…

MALICIOUS

PDF

69.8 KB Created: 2021-01-06 04:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5b22dc987496a64d48d7bc74eb54a9ca SHA-1: 989fe6f2accc66982194aee357bae82df5a0d6f2 SHA-256: aabcf4dca601dea3bde540dd6e7834603fe5b91abb34bac2846b5b2824ee01ce
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link farm and a phishing trojan. It contains numerous embedded URLs, with at least one pointing to known malicious infrastructure. The document body is heavily obfuscated, but the presence of embedded links suggests an attempt to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

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://cctraff.ru/aws?utm_term=missing+punctuation+worksheet+ks2 In PDF document text
    • https://tolafapod.weebly.com/uploads/1/3/4/4/134486806/3fdaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409806/normal_5ff2d518dce25.pdfIn PDF document text
    • https://suniponemiviku.weebly.com/uploads/1/3/1/6/131636748/bc9910e9381e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495387/normal_5fc0a9cf83a25.pdfIn PDF document text
    • https://rapovesotupoma.weebly.com/uploads/1/3/4/3/134353038/9323885.pdfIn PDF document text
    • https://tenubufaz.weebly.com/uploads/1/3/1/1/131164261/2109842.pdfIn PDF document text
    • https://jobugatiponez.weebly.com/uploads/1/3/4/2/134234820/6625354.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/1c1c52edc51d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nademopor/tovaxovufefajew.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/ffxiv_praetorium_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429842a5-00b7-44f6-8ac7-79a257718fad/46203584309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/874f19eb-3331-45cb-b8ab-ec54f2c2f709/55603865543.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/homelite_textron_chainsaw_manual.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_off0000d1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C2 5456 bytes
SHA-256: ccc7f3a23c3075a01f928b841e20ec8a9be5d058f53fb924198e918dd777ffb8
font_01_sfnt_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 10588 bytes
SHA-256: fcd5abecd1858cd611fdf14bf1014553f553053886f33c3560972bc36f78737c

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