Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40895f0bc21d293…

MALICIOUS

PDF

70.7 KB Created: 2021-03-24 05:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fe39c3ec6d330ff26c20df2abbf5f84d SHA-1: b55ea163c20943f643c158b7cd43519ebfb2dbb9 SHA-256: f40895f0bc21d293bb9a734cfb0c10a2b5cbf2a09d235fd47eac020e2aac5b39
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services, and one specifically targets 'lozipotod.ru' with a keyword suggesting a lure for PDF-related content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links on potentially untrusted domains, likely to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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=one+way+anova+questions+pdf PDF link annotation
    • https://kuwiliwal.weebly.com/uploads/1/3/1/3/131378779/b3b8d79db5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_60357a18dfc40.pdfIn PDF document text
    • https://bakabita.weebly.com/uploads/1/3/5/3/135309819/2582901.pdfIn PDF document text
    • https://zebewanuvaxa.weebly.com/uploads/1/3/4/6/134613040/6318553.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/f4bdc.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/mewen_fosenit_nefemelix_lukaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_604e54b1b9b09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417040/normal_5fe6618aea774.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456984/normal_5ff42dfb9b9b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412891/normal_5fe0a5a82dbf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422163/normal_6029ab37480f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5ffd3a3f6a6ee.pdfIn PDF document text
    • https://daxivikulogator.weebly.com/uploads/1/3/4/3/134308382/sebutipi-zukamemijezibi-fidetovex.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://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_6ddebc8ded144f38a32004bf6c3afd43.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobaziw/ff14_titan_ex_guide_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/narasimha_naidu_naa_songs.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_5706f7d5ac3947a58ce9578b67a096f7.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_6143a6cbe4c44336814ee8dff5f932a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jobavo/mcculloch_3200_chainsaw_parts_list.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/maeve_binchy_books_free.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_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 5196 bytes
SHA-256: 95ff5bdef56e6e4fa21c2a40a968b2c7246b6c0079ecfceb401ad283b2d35cf3
font_01_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 10660 bytes
SHA-256: 43f17daf0262718495d9a6bf013903778177e00823d24ba9261c6b9638a60a54
font_02_sfnt_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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