Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a51c1f7c1909ba8…

MALICIOUS

PDF

85.6 KB Created: 2021-04-08 09:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b2fae56f4181c5669c750b0764ebaccb SHA-1: 3b7ea47d2372742a03493850086916e0ab85ce3c SHA-256: 1a51c1f7c1909ba8cb26ee4d2d00b52123e50a7f20c4db9b43171bce810337ea
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with some pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, likely serves to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/wix?keyword=clarks+unstructured+men%2527s+un.bend+casual+oxford+brown PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408177/normal_600df23e878cf.pdfIn PDF document text
    • http://profoto22.ru/how_to_clean_a_whirlpool_dehumidifier_filter0hfj7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_601b3666a31b7.pdfIn PDF document text
    • http://lodorobirat.22web.org/bengali_song_pagalworld._io.pdfIn PDF document text
    • http://sejapamuji.22web.org/ryobi_band_saw_bs900_price.pdfIn PDF document text
    • http://itsnat.space/verizon_wireless_mifi_plans9nik9.pdfIn PDF document text
    • http://handler-autoscout24.com/59429366255n2qm6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5fe7d94a45c9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tadufaz.rf.gd/22851887884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd789afa-e919-407e-9222-49e2bcf01941/why_is_my_fridge_not_dispensing_ice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c275fecf-c7d4-4864-9dac-ea8ae251f187/55576224541.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_7b167eaa498f460bb5fd107f73a13330.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa791fb4-f31e-44b8-938a-81ba147c0499/33882794388.pdfIn PDF document text
    • https://6e6ad6c0-90f2-4367-a025-4e24aeda1d0e.filesusr.com/ugd/c9b7fc_4c58866fa59d40aea40cb6e8d3da50af.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_5eaa0b8c9f994e08b5ba600bde30e022.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4d1d8f-c72d-47f7-9417-1ec689359161/what_causes_more_discharge.pdfIn PDF document text
    • http://tatasoge.epizy.com/73923931343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb546503-65cc-4e7b-89a9-e1a66ffd6913/jbl_flip_3_waterproof_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/653d2145-93a8-4f6f-81ec-19d3010e7ab0/vixuluboxasime.pdfIn PDF document text
    • http://bubezowi.epizy.com/free_whatsapp_for_blackberry_bold_9700.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_85d250a286c64e47aabf6691bf94d86c.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 3188 bytes
SHA-256: e7c0a752930784f78a047b4372dc0fbab34c94deec81ea76449b1eb98db612f0
font_01_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 5500 bytes
SHA-256: d0cc2304e647d6b6a8e9b4e49c5abbedc3318a04b34d286cb0f37f7f15216005
font_02_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 11428 bytes
SHA-256: f3affabb4b57f4d5cb13f7d2208bcd4615e20d745beb2a9191365f0f08b391b6
font_03_sfnt_off0001329b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329B 16200 bytes
SHA-256: 8e64ef8962b5674587825f60987ad9ece034dabc19d45a495605b088aa328961

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