Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0287e57a5bd3323…

MALICIOUS

PDF

78.3 KB Created: 2021-02-20 10:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 576ccfe79c35e36e6abf1085b6e35b3a SHA-1: ada24484894efd159ba1467e0a3783366a85da5e SHA-256: f0287e57a5bd3323b9e7d38cd931899ff097ebcba56b9ea43c2fd93be9dcaec6
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically identified as a phishing attempt related to "Bunker hill security cameras manual". The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=bunker+hill+security+cameras+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5fd959ec069aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_60192c33b8b9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378383/normal_5fed37748c077.pdfIn PDF document text
    • https://cdn.sqhk.co/beluvano/ijcgjtC/fake_call_prank_shopee_wowowin_call_your_girlfriend.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_600ccff432581.pdfIn PDF document text
    • http://memunokenifat.22web.org/73235210801.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467003/normal_5ff019f548da8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_602072e37dc1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483604/normal_5fcbe4f2e07e4.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvapipitol/enjdid9/gun_shot_fire_war_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/savujegu/Uhbjchf/stock_car_racing_meaning_in_urdu.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/woneketelak/84024126319.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/60498196290.pdfIn PDF document text
    • http://gaxapokone.epizy.com/janupoxagokarofibasowum.pdfIn PDF document text
    • http://vimitafukufes.rf.gd/91949914752.pdfIn PDF document text
    • http://zerakunutage.epizy.com/game_boboiboy_apkpure.pdfIn PDF document text
    • http://gugikimu.rf.gd/lr_eswari_amman_songs_free_tamiltunes.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_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 5024 bytes
SHA-256: 32c96349dc81fc1f29250c939f489b51e1aebb4ada5d7e1a22048e81fa91fea5
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 10052 bytes
SHA-256: c710f996a0eff3e1f70b9184727a9fff6f354bfc1bc8800316964cfd03b3a740
font_02_sfnt_off00011d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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