Malicious PDF — malware analysis report

Static analysis result for SHA-256 44014f9270bd6db3…

MALICIOUS

PDF

77.5 KB Created: 2021-01-26 11:14:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c0cd07522f3d5996f0b8644b5410f6c SHA-1: 30a7cdd820046177684c264acb899353f8fd8c69 SHA-256: 44014f9270bd6db3d369707551b738069b6731d688a9963f0248bb64a7caa8fa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/aws?utm_term=f1+2019+calendar++pdf PDF link annotation
    • http://makipoduzoru.22web.org/51992409431.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/4Nldjbt/finanimigijazatejexedax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5fd34a152aa07.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/doghhfD/minidrivers_minibikers_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5ff221388e34a.pdfIn PDF document text
    • http://jumazuke.iblogger.org/alphanumeric_keypad_android_phone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462368/normal_5ffa95fb54e02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5fe8d1574a1ce.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://s3.amazonaws.com/pibajuwi/hadoop_the_definitive_guide_third_edition.pdfIn PDF document text
    • http://vufigenetusanu.epizy.com/happy_birthday_cake_images_hd_free.pdfIn PDF document text
    • http://sejedusodumevu.epizy.com/71154100457.pdfIn PDF document text
    • http://keguwaburafokul.epizy.com/vikopam.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/lupozikupuzapawufisumox.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/59597514901.pdfIn PDF document text
    • http://ziwivalotezeti.rf.gd/analogy_sentence_formation.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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 4960 bytes
SHA-256: 32913bc8d238fbe58de9c8c6cf7e177efe0a9979e523bcefc760109174a0981b
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 11552 bytes
SHA-256: fcc572ca13a9db30a0cb9a3e21af247073c727f82bb118e85d41bcb8dbb9489c
font_02_sfnt_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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