Malicious PDF — malware analysis report

Static analysis result for SHA-256 c597ea4e185a2783…

MALICIOUS

PDF

80.9 KB Created: 2021-02-17 14:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8279e1ce3b34473d7afb1290e1c44b99 SHA-1: 3c69bfdb8b6be0a835bacd50266726dd07438548 SHA-256: c597ea4e185a2783ceae679ab07f95d07f650968bb3d8cd14b4986425eb49d68
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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/123?utm_term=the+adventures+of+sherlock+holmes+tv+series+cast In PDF document text
    • http://cmb-societe.com/allok_video_converter_for_computerikvi5.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/icUjg5k/digital_meter_reading_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kawaniroti/hihWjjo/wheels_on_the_bus_melanie_martinez_lyric_video.pdfIn PDF document text
    • https://xamonato.weebly.com/uploads/1/3/2/8/132814301/gufozibikip.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/hgeiiza/dragon_quest_8_switch_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/eJLJUKF/cat_heat_pad_microwave.pdfIn PDF document text
    • https://duxupanitazubo.weebly.com/uploads/1/3/0/8/130813094/notukonisikojuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/widiroje/hdgdQia/ultimate_forest_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/azJhiiK/17919391002.pdfIn PDF document text
    • http://taptopbot.com/57787087538cd562.pdfIn PDF document text
    • https://cdn.sqhk.co/luvutagawata/ghifuOd/keks_pay_forum.pdfIn PDF document text
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/bumenomazifukexof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497131/normal_5fd1379e970bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409405/normal_5febf1e6d2558.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/rpYjagh/yellow_checker_star_taxi_las_vegas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403428/normal_5ffc862c21ac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449602/normal_5fdda54e92ece.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 5332 bytes
SHA-256: 049f45f7ea803b16c6c58f31a0d48597f68d72a2fd482b4f2b80ddd533cd017a
font_01_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 10852 bytes
SHA-256: 9e2cb9c029f629272a92c97a5b681441c3184f1967a46ffa700ad09bc5698998

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