Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bf4292db492e22…

MALICIOUS

PDF

69.5 KB Created: 2021-05-11 03:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e32279b55ae7adac6068e5d7f1c05faa SHA-1: 98083c21c48dc9f83eb7d3add9f38313a00ba445 SHA-256: f4bf4292db492e22af5aaa185dd31d97aefbf1af57471b23ad61da80e70a33e5
186 Risk Score

Malware Insights

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

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 0.9997

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://jottigo.ru/strik?utm_term=el+conde+de+montecristo+libro+mercadolibre PDF link annotation
    • http://larebalin.mypressonline.com/32738626927.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/xjdvihb/solaberolonezisixo.pdfIn PDF document text
    • https://tofajoxoroj.weebly.com/uploads/1/3/1/6/131636991/tilojoritis.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/giFihDd/35412840713.pdfIn PDF document text
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/118a59.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/djhjazy/purowopoxof.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/gtgiFlB/best_local_bars_in_las_vegas_nv.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/zumirubujobuvikipi.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/hfjfLie/fake_call_prank_call_fake_phone_call_app.pdfIn PDF document text
    • http://fegivate.medianewsonline.com/shortcut_tricks_for_number_series.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/Khiihjh/banco_do_brasil_pj_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_39ddd94f5ae849968f039834f1d58b18.pdf?index=trueIn PDF document text
    • http://nowimirozox.atwebpages.com/jugavagufexezoguba.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_b459de74f1bc4049886c3c6d189593fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/28603956695.pdfIn PDF document text
    • http://nanaxidimidi.atwebpages.com/bcs_question_bank_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/lugogunarigef.pdfIn PDF document text
    • https://764dfaed-7091-4b1c-a8ff-ceb5b694923f.filesusr.com/ugd/4bafdb_a5a91df81624488998c30c0257e42815.pdf?index=trueIn PDF document text
    • https://6e337ffa-6c75-4e98-916f-0cab85e7e3f5.filesusr.com/ugd/a22560_4617733c09d94229b5947b58e551cf89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/download_one_call_away_lyrics_mp4.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_off0000cfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA1 5184 bytes
SHA-256: 51763ab5436b170ce14a78b9821e1755e4e9729a847a5b39c94603b1d40353e4
font_01_sfnt_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 11580 bytes
SHA-256: 3fe58bc84441a7bd260050f3591a6d3f90271fdfb886cc75f4ac5bcce1ec386e

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