Malicious PDF — malware analysis report

Static analysis result for SHA-256 3526733b2d448216…

MALICIOUS

PDF

80.2 KB Created: 2021-06-04 19:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d2ed882a93bea7f3f27eb482f6f59ffd SHA-1: 30eee3c307edca95de334c94b06fa86af72026a5 SHA-256: 3526733b2d4482169c3e5549dae08e3961db01eacefc90f65ee3e6dd21c91264
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

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.
  • 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://xajibur.ru/123?utm_term=bradford+exchange+plates+value+guide PDF link annotation
    • https://gajaxaja.weebly.com/uploads/1/3/2/7/132712369/32785f.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/xunumujevonozuduko.pdfIn PDF document text
    • https://jirozonuk.weebly.com/uploads/1/3/1/6/131606844/9359fd2cbf774a.pdfIn PDF document text
    • https://gononazenikemad.weebly.com/uploads/1/3/4/4/134482012/pupofapik.pdfIn PDF document text
    • https://tesuxoka.weebly.com/uploads/1/3/4/4/134473976/8021168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459322/normal_6051f132d35e3.pdfIn PDF document text
    • https://zitujizu.weebly.com/uploads/1/3/4/7/134731650/detaso_lazazosijivo_povaladijik.pdfIn PDF document text
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/152cec7fe2c382.pdfIn PDF document text
    • https://bupitubijas.weebly.com/uploads/1/3/4/0/134040922/230f3fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496585/normal_605ff17cced19.pdfIn PDF document text
    • https://duvigefotazepex.weebly.com/uploads/1/3/0/7/130775674/kedesov_xapunorez.pdfIn PDF document text
    • https://rifatusozoked.weebly.com/uploads/1/3/2/6/132681337/vexekazizux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500429/normal_60341cc148b3c.pdfIn PDF document text
    • https://bizugejukuvav.weebly.com/uploads/1/3/4/3/134322279/ad67a820466.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144471297/80676679517.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/adobe_after_effects_cs6_full_tutorial.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144417654/novela_os_10_mandamentos_cap_60.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/68024950081.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/how_to_use_nurse_hatty_ketone_strips.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/w/file/fetch/144457512/is_there_a_auto_clicker_for_mac.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_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 5596 bytes
SHA-256: 43b64bd042892f2e7df81629fd7a7738d4ed332b5c33892dd19ab85aae6e24a6
font_01_sfnt_off00010b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 11304 bytes
SHA-256: ce8eae03e9689cfcb4907b252b095c8649c3ab817db5ca945296113919759f8f

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