Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f0d8dcea4ba3d6…

MALICIOUS

PDF

81.9 KB Created: 2021-03-29 05:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a17ac200b85e27d6f37dc7dfd0c0e20e SHA-1: c63edab4f8b4a7d4727e31435e349486c294457e SHA-256: e1f0d8dcea4ba3d6db99a6f52bda7496d08bc0e12545165ceca7bb4646a9c4cb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one prominent URL pointing to 'xajibur.ru' which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to legal terms, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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 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/award?keyword=difference+between+assault+and+battery+pdf PDF link annotation
    • http://spainsale.pro/17358465009jvgge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_600c59f59312b.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/jeM3giM/91727038372.pdfIn PDF document text
    • http://arm-watch3.club/17917225639pb5qu.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/MgijcHJ/90621024146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_60347994240f4.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/ijAih4G/19068936309.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/Ajdjijg/32908335824.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/eifsYjd/ledoroz.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/s2ijcW4/online_best_fit_line_graph_maker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_603b3d2a62492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_6054f5865d56f.pdfIn PDF document text
    • http://unlockdeals.shop/2872110313quzk5.pdfIn PDF document text
    • http://stankoff.org/21898892837ez16x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500201/normal_604a8afed7295.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/ikjahch/marvel_realm_of_champions_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_6029724f3c5cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_600dd805008d8.pdfIn PDF document text
    • http://clebohets.xyz/midwest_states_worksheet0brhj.pdfIn PDF document text
    • https://cdn.sqhk.co/xorazasuno/awig3id/fexoxubobomutonibemurijoj.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/BhgiKic/esmo_treatment_guidelines_melanoma.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/Iyhaaia/lavuwodenuvibokenu.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/vavale/gofoviz.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/jiselameme.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/ibm_and_the_holocaust_book.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/ribasul.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/80613043332.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_off0001015c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 5480 bytes
SHA-256: 1ee61edc0c502ba09e6e949e5aac9d4e2bad795324097b5823c48e87d860d434
font_01_sfnt_off0001142b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 10968 bytes
SHA-256: fb668f160c1e1066520b29cc52932914752b6cfd17dccd9ae8a57b2a5dbb7227

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