Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7acd849fa16fa3…

MALICIOUS

PDF

69.6 KB Created: 2021-03-03 04:55:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 9c5f9aa902b88c5df162a3198dbe31eb SHA-1: d10cc34aed5689b1c1a77ab22ae677fe9bbb0f63 SHA-256: 4f7acd849fa16fa3a5fdd26d2fa25a19bbd126343866ee5be3954407fe4b1d87
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or content-luring scheme. The PDF structure and embedded content are consistent with techniques used to distribute malware or redirect users to malicious websites.

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=guide+to+networking+essentials+7th+edition+pdf+free+download PDF link annotation
    • https://jomezafivawig.weebly.com/uploads/1/3/1/8/131856232/162ed545.pdfIn PDF document text
    • https://posilopawirina.weebly.com/uploads/1/3/4/3/134353572/e6eb0b1.pdfIn PDF document text
    • https://virenejamavik.weebly.com/uploads/1/3/4/1/134131854/digovisubenedu.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/aMInhFf/counter_terrorist_2_gun_strike_hack_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vituxezij/H2hegjO/xafobuvofusib.pdfIn PDF document text
    • http://ewwe.space/jalodidxljbo.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/obKgdib/54471122889.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/9754644.pdfIn PDF document text
    • http://persequenteamsohbet.com/buzz_cut_haircut_girlieooo.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/ghhhlhg/94883384510.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/black_and_decker_quick_and_easy_food_processor_instructions.pdfIn PDF document text
    • http://websecurer.tech/unbreakable_movie_mp4_free2harq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ronenitevodo/baotian_125_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/78915810566.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/pardesi_anthem_song_video.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E5 5452 bytes
SHA-256: 7fd92c1044bb5485836442320a844c4b46dcd0d0145d0d7d7c953fa12a7f0f84
font_01_sfnt_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 9772 bytes
SHA-256: e5ab5b67404487762ba4d4d8479b5afe16896f8b795ed99d981ea206fb801c59
font_02_sfnt_off0000faf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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