Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b3aeec6b556901…

MALICIOUS

PDF

69.5 KB Created: 2021-03-15 19:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b460149c8aa59d7f884b3e2430d2f3ac SHA-1: c3a9af7855f7155c6e253ce797317727fd7608a5 SHA-256: d4b3aeec6b556901887c9895147fbcf79187942362565e34f742a28790831ceb
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to link farms and SEO redirectors, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest this. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to download a second-stage payload.

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://resalured.ru/award?keyword=benim+hocam+paragraf+pdf PDF link annotation
    • https://zosafetudosejo.weebly.com/uploads/1/3/4/6/134670517/09077c9.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/81vicsa/arterial_supply_of_upper_limb.pdfIn PDF document text
    • https://mesowusiwa.weebly.com/uploads/1/3/5/9/135975120/1665650e.pdfIn PDF document text
    • https://badosajag.weebly.com/uploads/1/3/1/4/131407507/8ed11a58a6cd1.pdfIn PDF document text
    • https://lumewogomor.weebly.com/uploads/1/3/4/3/134319436/fafefis_nufukip_nizasabu_nusivijafo.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/VNidaid/naxugotikolufolopepupexig.pdfIn PDF document text
    • https://jumirugefof.weebly.com/uploads/1/3/3/9/133997886/7428915.pdfIn PDF document text
    • https://xemubafuwifo.weebly.com/uploads/1/3/4/4/134475424/pufokilanejemefifa.pdfIn PDF document text
    • https://vixekilawuta.weebly.com/uploads/1/3/4/3/134305586/2184931.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/2304779.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/vaxebisapesi/taniguxatoki.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/channa_ve_ghar_aaja_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/vezopidarugexagosumorebi.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/baby_birthday_photo_frame_app.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_b7cbf9b883ce47d0b121ace2d04d4a11.pdf?index=trueIn PDF document text
    • https://b760d8db-9746-4821-aa2b-94c9f806d328.filesusr.com/ugd/26ce45_bade6fff13d4410cb90283841c5385ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nokiva/rerosonogelojazibibowexe.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_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 5408 bytes
SHA-256: baab489adf7ad9d6bc1f8bf99b09b66fdf7b4162d2884f0646ea7173799d71b6
font_01_sfnt_off0000e075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 12580 bytes
SHA-256: ac516a109b10700113c4c22ad53a22c77d9bcf46bdd0662404623acd6f07879f

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