Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb547b12ace4a784…

MALICIOUS

PDF

75.4 KB Created: 2021-04-15 13:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e49bbce27c40376b08a03bf232d9b1ba SHA-1: d7271300411902b9667a2a0f8bb2b39aecf54400 SHA-256: fb547b12ace4a784484763549d2bcd5da21217b8ce2f89075adb509a2e32a649
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=linux+programming+interface
    • http://nopejinon.iblogger.org/amplitude_modulation_problems.pdf
    • https://cdn-cms.f-static.net/uploads/4479917/normal_606ea0284f76c.pdf
    • https://cdn-cms.f-static.net/uploads/4493549/normal_5fd9fd4fb29cb.pdf
    • http://zefutuwukeras.getenjoyment.net/xiwiwotititenonu.pdf
    • http://bapulesaj.mygamesonline.org/1924891176.pdf
    • https://cdn-cms.f-static.net/uploads/4499005/normal_6066a8a842eeb.pdf
    • http://nasevozowu.22web.org/bucket_bag_pattern.pdf
    • http://larumutul.getenjoyment.net/78377443980.pdf
    • https://static.s123-cdn-static.com/uploads/4384029/normal_5fff4921df6f8.pdf
    • https://static.s123-cdn-static.com/uploads/4417528/normal_600355d784109.pdf
    • https://static.s123-cdn-static.com/uploads/4454167/normal_6003805b772a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ed042439-856e-48bd-ad9d-231f76b804e6/why_to_study_theory_of_computation.pdf
    • http://zuvemodu.rf.gd/predation-starvation_trade_off.pdf
    • https://s3.amazonaws.com/safenalavojuwu/rufemanexawujubiz.pdf
    • http://pidukegub.epizy.com/brother_hl-l2360dn_replace_toner_error.pdf
    • https://s3.amazonaws.com/sobaketemu/small_jpg_to_excel.pdf
    • https://s3.amazonaws.com/jivuxo/band_mp3_all_songs_for_free.pdf
    • https://s3.amazonaws.com/pizivurapab/masererudutivopov.pdf
    • https://uploads.strikinglycdn.com/files/8cc21961-248c-4974-997c-cb0f4d7c0d0a/4000903666.pdf
    • http://kaponeja.epizy.com/69015436263.pdf
    • https://s3.amazonaws.com/zalomi/ariens_520_snowblower_wont_start.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ae.bin
491cc7f7da5c9a4f66352297a18787884ad3900cd83fcba734313b5d9801232a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 5136 bytes
font_01_sfnt_off0000fb26.bin
e0fb3e6381c60ada9dd503a8ccc32854e7a6899038175573ab5a54f69e932d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 10964 bytes

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