Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a1fffd8a9848de…

MALICIOUS

PDF

94.5 KB Created: 2021-06-01 19:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b56bd6c1297c2ddde24008bb4aed0b2e SHA-1: 5857b19461530533e122ea0732a319f65b6b4fdf SHA-256: 04a1fffd8a9848de957cc305b0639bcb76f4f65a127822b75134b277b4847f88
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://philabc.ru/pbw?utm_term=green+mountain+grill+wifi+troubleshooting PDF link annotation
    • https://karupijelajedo.weebly.com/uploads/1/3/4/8/134878973/dikaluvalur.pdfIn PDF document text
    • https://xomadugazulu.weebly.com/uploads/1/3/4/5/134597447/gaxateruwe-wusidejovep-dipopiwuwujer.pdfIn PDF document text
    • https://kekisuganuzab.weebly.com/uploads/1/3/4/7/134721312/nugawaned.pdfIn PDF document text
    • https://dewosuto.weebly.com/uploads/1/3/1/4/131453399/8030856.pdfIn PDF document text
    • https://lapadodipelij.weebly.com/uploads/1/3/1/1/131164402/revemajezezoxat_pewajut_gixesuzovav_wulubuvid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415327/normal_5fe49f6146386.pdfIn PDF document text
    • https://lifexego.weebly.com/uploads/1/3/0/8/130874678/xedagul_luluwuzosaz_lokizub.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/468990.pdfIn PDF document text
    • https://xanowiporak.weebly.com/uploads/1/3/0/8/130814060/mivusosizosorako.pdfIn PDF document text
    • https://xurebutira.weebly.com/uploads/1/3/2/6/132681359/xuzalarinifub.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4384642/normal_60b006d5c00a7.pdfIn PDF document text
    • https://vavemome.weebly.com/uploads/1/3/4/6/134609594/8122494.pdfIn PDF document text
    • https://roluliduz.weebly.com/uploads/1/3/4/7/134771057/dowubemar_zalop_jigadog_mafurixi.pdfIn PDF document text
    • https://sofubile.weebly.com/uploads/1/3/4/3/134380394/gefejuwodapig.pdfIn PDF document text
    • https://zarokosa.weebly.com/uploads/1/3/5/3/135300057/7932502.pdfIn PDF document text
    • https://walamemagiro.weebly.com/uploads/1/3/4/4/134441064/3948962.pdfIn PDF document text
    • https://bevoveruluvubox.weebly.com/uploads/1/3/4/4/134468080/d76d4225d8e.pdfIn PDF document text
    • https://salasusovalepeg.weebly.com/uploads/1/3/5/4/135401171/f233e5.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
    • http://zigunef.pbworks.com/w/file/fetch/144444276/how_to_calculate_isotopic_abundance.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/xupegufuli.pdfIn PDF document text
    • http://kibumezi.pbworks.com/f/miley_cyrus_wrecking_ball.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144470823/english_verb_conjugation_book.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/49762772488.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_off000123a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 5324 bytes
SHA-256: 0c92ddf1bfe8d8b2ac54475fac3ce0d0a08ad2c73fa1e6ef3014e31059eeb58a
font_01_sfnt_off000135a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A1 12284 bytes
SHA-256: c933581f39475393037cc65304e28123da8d7d4cd8c3980590429bc46444a7d7
font_02_sfnt_off00015e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E30 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333