Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d38eb39d4fa883…

MALICIOUS

PDF

74.1 KB Created: 2021-02-21 02:39:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a3b064793217818bd9047f138efe07c4 SHA-1: c77433409f7fb829d24abffeb86cd8360739d773 SHA-256: 36d38eb39d4fa883bb01f9193510833d8c536d4981ab68aa24895b3b4be13c41
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to contain keywords related to job salaries, likely as a lure. The presence of ClamAV detection and ML flagging indicates a high probability of malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wb?keyword=event%20operations%20manager%20salary%20in%20canada PDF link annotation
    • https://cdn.sqhk.co/susojitigi/eii8eia/age_of_apes_mobile_game.pdfIn PDF document text
    • http://sununetapa.22web.org/bexokebeluvekagulekarumif.pdfIn PDF document text
    • https://bulabameworiw.weebly.com/uploads/1/3/4/0/134096114/kikuwa-gepajagevuti.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/jjgeDgd/cards_and_castles_promo_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/Midhbg7/smart_pulse_oximeter_reviews.pdfIn PDF document text
    • https://gomujivas.weebly.com/uploads/1/3/5/3/135321586/ladagemuj.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/iajjDjb/saxopimogume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_602865ead04c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494657/normal_5ffa514b7fe14.pdfIn PDF document text
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/wusim_potezan_wenafad.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/gMiotjd/toolbox_mod_apk_1._16._20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421768/normal_5fd6ce817d8b1.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/icKgjgi/real_racing_3d_download_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375351/normal_5fcf3349634cb.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/MldiauK/virtual_piano_keyboard_windows_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufejudo.epizy.com/rupinder_gandhi_2_song_buklan_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 5512 bytes
SHA-256: 5614fd5a79cb996f06cdf3bd87780056327b81a305a31113698a646ad53a1776
font_01_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 11632 bytes
SHA-256: d05219e1688fce2cfe97f88e348950ea630950315e928225a9b07076cd9a5b1c

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