Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbfa4da6fe26999…

MALICIOUS

PDF

86.1 KB Created: 2021-04-03 20:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b542c1db82bea9619541dd086d907a43 SHA-1: 74e53a0c33498eae00135a89a1b833e02b804460 SHA-256: abbfa4da6fe269994b51a75346b3dd5035c534a9fac4f8da11705012de047bc3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The primary URL, 'https://dafemum.ru/wix?keyword=oceanhorn+mod+apk+android+1', suggests a lure related to game mods. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan. The presence of embedded URLs and the PDF's structure strongly indicate it's designed to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/wix?keyword=oceanhorn+mod+apk+android+1
    • https://bumesusibob.weebly.com/uploads/1/3/1/8/131857970/netijituloxiwetif.pdf
    • https://mevagosulen.weebly.com/uploads/1/3/5/3/135391340/a91ceaa91cf.pdf
    • https://wilemixi.weebly.com/uploads/1/3/0/9/130969959/76989b9d.pdf
    • https://funefazadoma.weebly.com/uploads/1/3/4/6/134648765/dizavebomogew.pdf
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/4354173.pdf
    • https://tajuwelaf.weebly.com/uploads/1/3/1/0/131071184/5115110.pdf
    • https://robivobaxo.weebly.com/uploads/1/3/0/8/130873737/pamijuti-wigusawufo.pdf
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/4b12eda7.pdf
    • https://wisufomerimugil.weebly.com/uploads/1/3/4/0/134016782/zafok-biguziporef-wavawow.pdf
    • https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/4255726.pdf
    • https://debagodijif.weebly.com/uploads/1/3/0/9/130969595/1398211.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tumasun/49449553580.pdf
    • https://s3.amazonaws.com/bovenotojitowe/rockwool_intumescent_mastic_safety_data_sheet.pdf
    • https://s3.amazonaws.com/siwixomudit/immunization_schedule_in_india.pdf
    • https://s3.amazonaws.com/mefonevimimix/churchill_home_insurance_claim_form.pdf
    • https://s3.amazonaws.com/palevijuj/does_fingerhut_report_credit_limit.pdf
    • https://s3.amazonaws.com/julaxel/danza_kuduro_music_sheet.pdf
    • https://s3.amazonaws.com/nuxulikiwab/93361790703.pdf
    • https://s3.amazonaws.com/kewuxejikiwe/how_do_you_say_mandarin_orange_in_portuguese.pdf
    • https://s3.amazonaws.com/lusabifef/21626271699.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/chest_guidelines.pdf
    • https://s3.amazonaws.com/libeganot/95283266427.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef5.bin
69b77d15abf92daab2a71f0d3d501b48580f317ddfabbc471c6510701d0dafcc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 5244 bytes
font_01_sfnt_off0001009d.bin
9b4e135bf92bdf51ec1273853b8bc7363faafdd46fbde147f7f52ece21caeb90
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 23344 bytes
font_02_sfnt_off00013447.bin
d64bc6380e0eaa1176cac3164d67defa127098331a48f6beb6813acb26cb21ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x13447 16172 bytes