Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff600e819bd7e163…

MALICIOUS

PDF

88.1 KB Created: 2021-02-27 22:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8a658ca32f4cf9455a5aade0f7400a64 SHA-1: fca5d3428b4ba06e5024329607d6b0eac9bcf7b6 SHA-256: ff600e819bd7e16398c6812ec9dfaf80313ba8987ebc9e42850900c6fbc27131
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://nipisod.ru/strik?utm_term=black+hawk+down+movie+download+in+hindi+filmyzilla PDF link annotation
    • http://rubewox.sportsontheweb.net/nonugimejilijoxexevu.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/fSjbjik/vitamin_cottage_grand_junction.pdfIn PDF document text
    • https://cdn.sqhk.co/mulepava/gi5Fjie/water_flow_effect_in_3ds_max.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_6009db5600bb3.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/iibgeAQ/game_dev_tycoon_guide_ios.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/kosal.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/how_much_do_mechanics_make_nz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5fe92c57b4e82.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/napedakukobijidomizizov.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/is_harry_potter_cursed_child_worth_it.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/hkjgVdY/pink_piano_keyboard_with_stand.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/78294684112.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/que_es_caida_libre.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/53940849717.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_off00011aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 5404 bytes
SHA-256: 759b9d67e009c99a88d91650ec07890778155c7a5420005d20427c00ee8f1450
font_01_sfnt_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 11236 bytes
SHA-256: 0fe35719e088bdcac52a15905b2e1c2cd4fc1416c8980dfb2d94d7d5ca900087

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