Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c3d6906d6084a6…

MALICIOUS

PDF

105.0 KB Created: 2021-03-12 04:53:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 694264e58b89a2dd18d78fc110f39a9c SHA-1: 396a0b3ef979a4d8454a6b638d740e7f266361d1 SHA-256: b9c3d6906d6084a6ec61aa26fa8e05afae80e97065462cf3e89d628d166c6456
194 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical PDF link farm detection and a ClamAV signature for Pdf.Phishing.Trojan. The document contains numerous external links, many pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a download button lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/strik?utm_term=engineering+materials+rk+rajput+pdf+free+download PDF link annotation
    • https://tojisoma.weebly.com/uploads/1/3/5/3/135330836/6193158.pdfIn PDF document text
    • https://gabonavokelog.weebly.com/uploads/1/3/4/6/134684269/vipitetezepu.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/75644497599.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/more_than_words_tab_songsterr.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/wizudeluw.pdfIn PDF document text
    • https://pejetoli.weebly.com/uploads/1/3/1/4/131454808/dce18fd1ef21d6b.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://uploads.strikinglycdn.com/files/edcfd24c-ff33-450c-b945-3f89596a79bc/lowrance_hook_3x_fishfinder_manual.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_59f4e0dba72f4481bd6d2f61ff0d83ec.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_60a05c31507542ef8e69c58097d4733f.pdf?index=trueIn PDF document text
    • http://wirileso.epizy.com/78112198775.pdfIn PDF document text
    • http://luwemazezabubat.rf.gd/hill_manufacturing_msds_sheets.pdfIn PDF document text
    • http://kesolimasakifi.myartsonline.com/beethoven_piano_sonata_no.17_imslp.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_146c9dcd90ca4e2ebf90b2ab36d005be.pdf?index=trueIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_d0b554fec180439ba84d86b677fb8cd4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/54367186728.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_ec67a636fd1c40ccb401dc4b24c495e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6360a27-9826-493a-9816-2c1f7d1f99d7/38493276024.pdfIn PDF document text
    • http://kenuzuwemonuda.epizy.com/how_to_erase_codes_with_actron_cp9125.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/wopujubitexukejal.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/blood_stone_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/sport_tv_2._0._6_apk.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015c57.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15C57 23216 bytes
SHA-256: f286c385d0bf892b89ccba7dd959e252d7706bf63447a5658d8f03ecb98f7a97
font_00_sfnt_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 5432 bytes
SHA-256: 118b0d1ab1dcaefee9a0fd699dd063e0696f4f33664614e5c45a88d99454463b
font_01_sfnt_off00013424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13424 11960 bytes
SHA-256: 8fad5f9e1a3e9fb946af11c8f2d47f2d0ab7e7332337bf2a664ce6ec21581c43
font_03_sfnt_off00018545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18545 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2