Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ff802a60d6ba4f…

MALICIOUS

PDF

79.0 KB Created: 2021-03-02 11:49:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e87e6fc056fd1c9fd02d5c0faab05e63 SHA-1: 57a1eb48190a11aeba7f930b1bbc69eb82ff6d3c SHA-256: 43ff802a60d6ba4ff87721251768ded61fde5f58a6cc51e1524b39ffd2620aab
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or phishing operation. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'yafferge.ru' as a known malicious redirector. The ML classifier and ClamAV also strongly indicate maliciousness. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/strik?utm_term=three+billy+goats+gruff+book In PDF document text
    • https://tukumexof.weebly.com/uploads/1/3/4/7/134721389/568550.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/hfgixGS/32723408120.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/4057804.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/ZgeigFS/gipaze.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/d3pmiio/wheel_of_fortune_game_online_free.pdfIn PDF document text
    • http://taxafig.66ghz.com/namita_agrawal_odia_bhajan_song_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/hajcyLy/zezumonimelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_6017f74e46609.pdfIn PDF document text
    • https://wozukaziximuru.weebly.com/uploads/1/3/4/5/134587045/sesipemo_guzekediwiri.pdfIn PDF document text
    • http://vofuvomo.iblogger.org/pvc_glue_sds_sheets.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/7dc978f877ff8a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/tencent_gaming_buddy_emulator_english_version.pdfIn PDF document text
    • http://vezabixu.rf.gd/8701350200.pdfIn PDF document text
    • http://tumaxokalabad.epizy.com/coercive_leadership.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/ak_47_machine_gun_sound.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_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 5284 bytes
SHA-256: fbf0249ac2c98d61df81fb3b487d71a31c056906ecaa6f3e551654c26551b278
font_01_sfnt_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 12756 bytes
SHA-256: 3f0772693ca24fa027069344f51d8a097c5fdb65ee64d25e8c6c88b7e0a7511a

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