Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5c897bc3d43e16…

MALICIOUS

PDF

121.7 KB Created: 2021-03-30 03:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a04bab6956cd4e85ae152957a1b56304 SHA-1: b6be97a51f7ef9df1ca13fa1ed1bd7db5988da75 SHA-256: db5c897bc3d43e16dabaa9796dfdd44a74292d545ab9c014e63a71614930980a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains text related to search queries, and the embedded URLs point to link farms and potentially malicious content. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xajibur.ru/aws?utm_term=what+is+the+meaning+of+the+bridal+veil PDF link annotation
    • http://lomuwugevona.getenjoyment.net/85932184015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_5fd76b165488b.pdfIn PDF document text
    • https://zotabuja.weebly.com/uploads/1/3/4/5/134510490/bimonezipedav-xisorudozida-zuxokabafoje-dodexakutiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479904/normal_605909b8de6ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421782/normal_605ad38a28340.pdfIn PDF document text
    • https://wazalopa.weebly.com/uploads/1/3/0/8/130814586/2a4721d6ac7d1.pdfIn PDF document text
    • https://waxovidimised.weebly.com/uploads/1/3/4/4/134446407/2979ef296db2059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_600faa6636dc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_605a08e7001f4.pdfIn PDF document text
    • https://xalekosud.weebly.com/uploads/1/3/5/3/135350534/kunazi_siketu.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/1000056.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477155/normal_5ffa2e2692990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_6054b7080dcde.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c10950-31c7-4709-9cb3-66320671688e/americas_best_chicken_wings_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e84c14-0025-4957-b0ac-6169d78146eb/how_to_find_my_kitchenaid_mixer_model_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d62423-742d-411a-8ac3-5d94bca77805/bafunilivoxunimerosedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/560484dc-d87a-4162-8eb6-b20c62c5c6fd/65950237076.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/game_mirip_animal_kaiser_di_android.pdfIn PDF document text
    • http://bafuwujix.atwebpages.com/journal_of_sport_and_social_issues.pdfIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/worowes.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/9823478445.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_off00019886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19886 5532 bytes
SHA-256: 1db08ef28bcbfabd600bd0b9b64e6807ca87e14017e6ef2d2378be634a8291fa
font_01_sfnt_off0001ab3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB3B 14240 bytes
SHA-256: e60ff0acd4bbe30fe096d712551612ea6786d38e0f4336b79042582861083931

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