Malicious PDF — malware analysis report

Static analysis result for SHA-256 436b6c5a3523a804…

MALICIOUS

PDF

89.0 KB Created: 2021-03-14 21:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f229be405bb7f8381062007f2f5f2fa3 SHA-1: 2dd468686c1df82fd0bf60d1fdc9a22c001bc1ec SHA-256: 436b6c5a3523a804f9924a826a4f9e67eefec209fa4bc93e11a623d5417b90fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=springboard+precalculus+book+answers
    • https://cdn.sqhk.co/berirenike/ibgcF8H/best_bushcraft_pocket_knife.pdf
    • http://lnstagramverifycentre.com/mrs_funny_bones_free_download3dxmr.pdf
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/jasowalez_timigedepikawi.pdf
    • https://cdn.sqhk.co/zulatobi/yigFb44/grow_financial_credit_union_careers.pdf
    • https://cdn.sqhk.co/rorajakura/hgeuul8/bts_idol_call_youtube_views_deleted.pdf
    • http://trendmobile.ru/vans_old_skool_platform_white_off_the_wallkr2mx.pdf
    • https://fuxexitir.weebly.com/uploads/1/3/4/0/134098624/2769039.pdf
    • http://theharaka.online/how_to_figure_out_mixing_ratiosl8pw1.pdf
    • https://cdn.sqhk.co/bodavadu/k0igibD/71185964853.pdf
    • http://belkwigs.com/weber_spirit_classic_e_210_gas_barbecue_coverdt45u.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/026bc174-d476-4164-99da-432a6aaaa284/14994723452.pdf
    • https://s3.amazonaws.com/vavejijitatofu/wamofoguxalava.pdf
    • https://s3.amazonaws.com/sumesawoxajew/89997186367.pdf
    • https://s3.amazonaws.com/zifilobesumafi/20425098816.pdf
    • https://uploads.strikinglycdn.com/files/ace7eb81-49ef-4adc-8877-8b8107931425/38290422152.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cb7.bin
d78aa1db801ce59293052fe68d2f9481f87c2a1d6cbc168d03570235dfa5e5de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 5440 bytes
font_01_sfnt_off00011f3e.bin
8c107d1d9017a882ea882188791ac985b144fa8bddffc2b90e23aa267916e1e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 12376 bytes
font_02_sfnt_off0001491b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1491B 4324 bytes

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