Malicious PDF — malware analysis report

Static analysis result for SHA-256 33de4391bc35dad7…

MALICIOUS

PDF

81.7 KB Created: 2021-03-25 03:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06d762cbf785d87f27ed6f15bcfee0fa SHA-1: 762a17a9f75a17f223f9dbd4db4d1788b93d1e68 SHA-256: 33de4391bc35dad7e88d1d4111c2112678c5fc9ee6415df8ccc77f4f682b1d2a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and hosting services, indicative of a link farm or SEO spam operation. ClamAV and ML heuristics flag the PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest a redirection mechanism to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://lozipotod.ru/award?keyword=spark+tutorial+python+pdf PDF link annotation
    • https://cdn.sqhk.co/madosodu/KicFdgf/34217712782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_602d2f98ac198.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/iagi3vy/51174038637.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/jjjaTge/vexed_antonyms_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_60443f9444e73.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/XjgvIlP/68976752992.pdfIn PDF document text
    • http://getveran.site/denon_avr_791_resetjbgt1.pdfIn PDF document text
    • https://jeralizijofuki.weebly.com/uploads/1/3/4/7/134710598/6187665.pdfIn PDF document text
    • http://worldthailand.fun/brother_printer_hl-l2370dw_toner_resetfimgl.pdfIn PDF document text
    • https://fanuwatesovize.weebly.com/uploads/1/3/1/3/131380837/5928271.pdfIn PDF document text
    • https://duzozerijadid.weebly.com/uploads/1/3/4/4/134493401/6094011.pdfIn PDF document text
    • http://copytoshka.ru/jituvipowaxodv2e1q.pdfIn PDF document text
    • http://usesol.xyz/988997935192c54c.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/QQUPjjW/graphing_sine_functions_worksheet_answers.pdfIn PDF document text
    • http://iwhite.space/labugoqm40k.pdfIn PDF document text
    • http://eushopvmn.site/68333156015x8gtb.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/how_to_work_the_frigidaire_dishwasher8ks5h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_6017988f6d2c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447095/normal_5fca6b5e38a87.pdfIn PDF document text
    • http://onlinekartiadesi.com/267329986489sslh.pdfIn PDF document text
    • http://7gusevshop.website/cassiopeia_combo_guidenlivl.pdfIn PDF document text
    • http://polnews.xyz/94130431909bytud.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
    • 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_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 4984 bytes
SHA-256: 9404e50b5ea1b3499d121c0b389f0eac59af2fa785315d973d65aa26c97ca3d0
font_01_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 10332 bytes
SHA-256: eb1078c08119e044902b163f50b0c7f9ead26564e9e67db9cd2e6308e4534793
font_02_sfnt_off0001296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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