Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2be7343f8b4bd5…

MALICIOUS

PDF

73.8 KB Created: 2021-03-25 01:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: ba51cb7df7996787cb318036ad501e5f SHA-1: 2331d712f9e2bc1e9d43e0a7daf30dd51fd2a599 SHA-256: ac2be7343f8b4bd56aaf4094c2c8e469230917d9ac0937fcf949a791a2b1136c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to 'xajibur.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, suggests a lure related to 'broad spectrum antibiotics pdf'. The presence of external URIs and the overall detection profile strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xajibur.ru/award?keyword=broad+spectrum+antibiotics+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391649/normal_5ffb23aaef7aa.pdfIn PDF document text
    • http://natbeach.space/old_rascal_scooter_for_saleepakp.pdfIn PDF document text
    • http://kmplitka.shop/tipos_de_comunicaciones_inalambricas1wcu5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_601b8debdd254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445324/normal_60299b910025e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_6025b66d93536.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_554b61f2d0744f529b4e44e0e4db41c5.pdf?index=trueIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_0e5d758dc4cb432bb2439e3aebe0fe4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizaxo/what_are_the_examples_of_derivation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f6b1bf1-106f-408f-b49e-ae5480dc0842/37466144854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c2bbb0f-64e1-4741-b9ec-838f48f9217d/how_do_i_check_my_food_stamp_status_online.pdfIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_01221531720949128233a11277984b43.pdf?index=trueIn PDF document text
    • http://lupevara.epizy.com/bhumi_bangla_band_all_songs_free_mp3_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/cookie_policy_template_eu.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/59364386464.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_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 5456 bytes
SHA-256: cf563f40b7c4367a4268c0b78a0e9ee3d959af994935da2d7f675932d593edd6
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 10852 bytes
SHA-256: 215aea605e657e939e7b2e9193c1adb7bf4d64463d99e28577d0c03a79e5e8f2

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