Malicious PDF — malware analysis report

Static analysis result for SHA-256 1826c9b14d5a8172…

MALICIOUS

PDF

66.5 KB Created: 2021-01-15 18:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6e653608f560cfac8c65a8fc3e5ed965 SHA-1: ddfdf74fa185fbc3b690818a5a3aee13502d9db5 SHA-256: 1826c9b14d5a817273a52d501264c8b461dd2e8b54cfb3de0729d28e316bc380
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded links are the primary indicators of malicious intent, likely directing users to phishing sites or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=ouidad+curl+quencher+moisturizing+conditioner In PDF document text
    • https://nizufamira.weebly.com/uploads/1/3/4/3/134310662/8107813.pdfIn PDF document text
    • https://duxotitur.weebly.com/uploads/1/3/4/5/134596147/6d0b2.pdfIn PDF document text
    • https://site-1201825.mozfiles.com/files/1201825/lagu_andien_puisi_cover.pdfIn PDF document text
    • https://site-1197000.mozfiles.com/files/1197000/words_in_a_pic_answers_svenska.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/2a42fd73b53bede.pdfIn PDF document text
    • https://lalonofinesuver.weebly.com/uploads/1/3/4/4/134442061/vasemiruwo.pdfIn PDF document text
    • https://cdn.sqhk.co/mabuviko/HFhahjH/kung_fu_panda_3_netflix_country.pdfIn PDF document text
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/8253865.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/pidufozu/mebuvipexa.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/7773348953.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/8340589626.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/wekisisaseni.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/82328544436.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_off0000c4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D8 5556 bytes
SHA-256: 9b122b4a4d4cf295683e79f1ffe20babb5115ada61f98e239d99a1c74900ff7d
font_01_sfnt_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 11008 bytes
SHA-256: b6f8409065f49fd5c4d747f9991b815cc41ea41203daffa49af61f1156ba8595

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