Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b34cd9fa7451a64…

MALICIOUS

PDF

74.1 KB Created: 2021-02-23 19:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1670f9b030dd2ff16782b32c8644202e SHA-1: 5f4862a297b576f12ac0b74a81aef2a9144392b2 SHA-256: 3b34cd9fa7451a64a6594e764f650156fb656d20b179ee0a4e2785e9bf8357d3
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with a critical heuristic flagging it as a PDF link farm. The document body is heavily obfuscated, but the presence of embedded URLs and the link farm heuristic suggest a phishing or SEO manipulation attack. No scripts were extracted, but the PDF structure itself facilitates the malicious activity.

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
  • 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.
  • 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://jottigo.ru/123?utm_term=hp+elitedesk+800+g1+sff+ram+type PDF link annotation
    • https://ginubeputugexow.weebly.com/uploads/1/3/0/7/130738710/6394041.pdfIn PDF document text
    • https://cdn.sqhk.co/lokalofobox/bhiiehf/kafol.pdfIn PDF document text
    • http://webmastervlad.ru/9629894765ljs0i.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/hipZhad/balloon_tower_defense_unblocked_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/hegifia/kigubipexegagepadaxek.pdfIn PDF document text
    • http://tomogorman.com/3749780047301fci.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450719/normal_600e473d0df08.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/he0jbeK/multi-_colorful_tunnel_survival_of_the_fittest_mtg.pdfIn PDF document text
    • http://pumba-timon.space/mevozozol82.pdfIn PDF document text
    • https://vagafanuwojuxiv.weebly.com/uploads/1/3/0/7/130776749/fafusonikekodawosij.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/wigezafujatiso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444095/normal_5fc6ab2597eae.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/fobupojowojon/wodulop.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/65142599382.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/clinician-_administered_ptsd_scale_caps-_5.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/33710801923.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/vidmate_er_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/bexowinuwobusomibarusir.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/65704270412.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_off0000d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 5876 bytes
SHA-256: aeaad033c4172f3a080491d31e77d28a390bd72b5ff4d094833cc7ecfaf717ac
font_01_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 16896 bytes
SHA-256: 43a85fc9009fd1e4bc7a87bb1566ca0a66cb33b425e60e93f7ee627b1f7b43a6

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