Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76f0fb679f34067…

MALICIOUS

PDF

66.6 KB Created: 2020-11-29 22:07:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d4f114014e792781c9ebc958f014d3e9 SHA-1: 1731b50e750d99800d251c0c1884776f910b4586 SHA-256: a76f0fb679f340679f65648a19531e14137275db8de548d03a98346d3ede1920
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as part of a link farm and redirect to malicious infrastructure. The presence of a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the ML_NYX_PDF_MALICIOUS flag strongly indicate a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for SEO manipulation, further supporting the lure-based attack pattern.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=big+fish+audio+mariachi In PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/3277145.pdfIn PDF document text
    • https://wiworixoso.weebly.com/uploads/1/3/4/3/134321663/7707606.pdfIn PDF document text
    • https://nokojuponamipi.weebly.com/uploads/1/3/4/8/134891784/tenakilen-gadibodibedum-jokidegafudelu-folejazuzudubuk.pdfIn PDF document text
    • https://gowubezu.weebly.com/uploads/1/3/4/4/134497845/a40cb90.pdfIn PDF document text
    • https://difiraboveju.weebly.com/uploads/1/3/4/5/134508976/loliwe.pdfIn PDF document text
    • https://rivebopufu.weebly.com/uploads/1/3/4/6/134663658/d30834e.pdfIn PDF document text
    • https://gafanotode.weebly.com/uploads/1/3/4/5/134576189/8352718.pdfIn PDF document text
    • https://namukizup.weebly.com/uploads/1/3/4/7/134748015/widujalufofutodebok.pdfIn PDF document text
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/9822832.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/megelugik/star_wars_rogue_one_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/wudelugutatufovimudiwigol.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/bollywood_movies_hd_sites_list.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/alert_and_fully_informed_crossword_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/44958715255.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D7 5452 bytes
SHA-256: 926d1f04d3c23239c02aa73f29f0829d2e757d6dab7266ff1d077a9a95e765e8
font_01_sfnt_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 10368 bytes
SHA-256: dbd177b2cb97c2a1ee65317b7736abbc98258d1d6f9b9796cef74ccd689a7a64

Open this report in the interactive analyzer, or submit your own file for analysis.