Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb8b399d53985db…

MALICIOUS

PDF

80.1 KB Created: 2021-03-22 00:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ca1f325548559326c564802ba6b6a1c SHA-1: 7a9bc2cdf12be678863b952777e93131948b05e1 SHA-256: abb8b399d53985db86ee3e3a7ad192cefd52b09900eb383335a5a446228c0220
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 point to unknown or potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=auto+chess+mobile+guide+indonesia
    • http://normal-id.com/properties_of_water_acids_and_bases_crossword_puzzle_answersma21z.pdf
    • http://zuvels.xyz/biography_hollywood_movies_free4bxla.pdf
    • http://lightstart.xyz/7_gauge_steel_sheet_thicknesssowhu.pdf
    • http://small-italy.space/23280190583io8fo.pdf
    • http://odemebayisitrafik.com/folopujiwafegovuvik842ir.pdf
    • http://urro-hu.com/granny_2_for_pc_download7o7my.pdf
    • http://andyhong.blog/alkene_nomenclature_practice_worksheetp3wbq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kaxukok/call_of_duty_ww2_android_gameplay.pdf
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_0a06cdbae4754f19acbafc3d43348757.pdf?index=true
    • https://s3.amazonaws.com/dosipive/format_date_vba_excel_macro.pdf
    • https://s3.amazonaws.com/nelizenejakarug/9415072903.pdf
    • https://s3.amazonaws.com/wopari/14636566267.pdf
    • https://s3.amazonaws.com/lukepepe/radobejegaz.pdf
    • https://s3.amazonaws.com/bopuxosavubare/56202482202.pdf
    • https://s3.amazonaws.com/veledabejufi/how_to_work_out_volume_in_litres_from_cm.pdf
    • https://s3.amazonaws.com/gedimuta/61485032484.pdf
    • https://s3.amazonaws.com/nevovumowa/88839127861.pdf
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_a67b533bc7724d30922abd237f239812.pdf?index=true
    • https://s3.amazonaws.com/fowonaxul/favukulizi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee96.bin
d353e531aa0f19a6230029270fbf71088c029f45a22781838d4485129bc7bf4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 5384 bytes
font_01_sfnt_off000100bc.bin
2addca0b808c8fe1f7a701de8469570fb128d6aa3b0eabf563b8f51f84f9e5e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 22296 bytes