Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8de381ad6eddd3…

MALICIOUS

PDF

72.1 KB Created: 2021-01-23 07:31:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c1fecee25bcaef907ef917067cce5a07 SHA-1: 9292742cc7feef234574994d97d585e5157920f6 SHA-256: 5d8de381ad6eddd3252fba99d9f15e970de849e656ee1b14330527d9ff9e8cea
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to link farms and redirectors, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://leonvi.ru/123?utm_term=which+one+doesn%2527t+belong+graphs PDF link annotation
    • https://zawibovime.weebly.com/uploads/1/3/2/6/132681883/veworinifixuga.pdfIn PDF document text
    • http://betixisu.22web.org/77029940974.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417308/normal_5fc688708b911.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5fef8bde2bb6e.pdfIn PDF document text
    • https://site-1168272.mozfiles.com/files/1168272/83702401011.pdfIn PDF document text
    • https://site-1171687.mozfiles.com/files/1171687/99030959848.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/musuzawuzuli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488092/normal_5ff06209f0ccb.pdfIn PDF document text
    • https://sunanineriputa.weebly.com/uploads/1/3/2/7/132740954/robuzep.pdfIn PDF document text
    • https://site-1177591.mozfiles.com/files/1177591/formal_wedge_heels_black.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389571/normal_5ffdd4dfd8cc5.pdfIn PDF document text
    • https://zoradelageruwol.weebly.com/uploads/1/3/4/5/134591251/5c62177.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381083/normal_5fc8378f0a2b2.pdfIn PDF document text
    • http://voduvalegef.66ghz.com/becoming_a_good_leader.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xefavab.rf.gd/10572114397.pdfIn PDF document text
    • http://kowewewabozete.epizy.com/46466369810.pdfIn PDF document text
    • http://xaxidos.epizy.com/xevozibezilixolizi.pdfIn PDF document text
    • http://nowaginog.epizy.com/96093530204.pdfIn PDF document text
    • http://dijawazuk.rf.gd/octopus_apk_apple.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/crafting_leveling_guide_osrs_f2p.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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 5520 bytes
SHA-256: 980a3c11980ff2f893480a207ec47fbfefc4f6e376f53a2a22fec163a21a130a
font_01_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 11176 bytes
SHA-256: 8ee481ffd4a30520e5f8f2c1eebfa1989b23649f70e669cbfba376509ab5ca73

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