Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c0fd4a965873c3…

MALICIOUS

PDF

89.4 KB Created: 2021-03-10 09:30:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eb004b862e886733cd844a3887b5aa95 SHA-1: 4e75e4919e2750cc87bc42c1587102bdb3836dfd SHA-256: a3c0fd4a965873c33c3bbe009ca42b9c3a3094b314915b969e9c57aeb75eccf6
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=in+spite+of+despite+exercises+pdf PDF link annotation
    • https://cdn.sqhk.co/totimujid/eijOM7e/luxopafajexone.pdfIn PDF document text
    • http://xebupado.mypressonline.com/absceso_en_la_piel.pdfIn PDF document text
    • http://buputenajonix.mywebcommunity.org/bodugexo.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/aCjaqjb/74817331935.pdfIn PDF document text
    • http://gisujug.mypressonline.com/pefodurukikexedujudoxik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_600ec1d376183.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/fg_knot_tool_-_youtube.pdfIn PDF document text
    • http://silujokiz.mypressonline.com/tizafedevujalijejuwowuz.pdfIn PDF document text
    • http://suxoxaxowigab.scienceontheweb.net/dd_classes_3.5e.pdfIn PDF document text
    • https://cdn.sqhk.co/wadebekop/hjgeRrf/star_wars_x_wing_fighter_lego.pdfIn PDF document text
    • http://lapiwudoxavov.scienceontheweb.net/xekukupajebab.pdfIn PDF document text
    • http://sweetmeet.online/wugejanaduftccmu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393485/normal_60460f6c76cb5.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/65762309889.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/bergeys_manual_of_systematic_bacteriology_volume_1_download.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/hc_verma_geometrical_optics_questions.pdfIn PDF document text
    • http://meetchat.space/rockabye_audio_musichl8ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nununad.myartsonline.com/xujawivoguwupomawef.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_off0001222d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222D 4912 bytes
SHA-256: d0b20fdd863bd54a4cd1d8a68c5af0c40ed5b123740e03d97c1dd6fcabdf4b93
font_01_sfnt_off000132fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FD 10468 bytes
SHA-256: 2016aef3e59a7be22ca2c0be51e34d34fafb6ab4aca2ac3e5cfb8ea2231af5f4

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