Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10a825f97397dab…

MALICIOUS

PDF

81.2 KB Created: 2021-04-15 01:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3969f570f985636adbea29b008ad4a00 SHA-1: b17ad146b18f8d0c0edfd15e492410c85997c415 SHA-256: b10a825f97397dab6f29cc8380175b4b084afef0780e6c14e30182621975d66f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of the URL 'https://jottigo.ru/strik?utm_term=the+4+love+types' further supports this, as it appears to be a tracking or redirect URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/strik?utm_term=the+4+love+types PDF link annotation
    • https://cdn.sqhk.co/xederebat/hbER35r/grimvalor_cheats_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tatakakuwito/SheWm7F/monster_truck_coloring_pages_for_kindergarten.pdfIn PDF document text
    • https://dubezotamepaloj.weebly.com/uploads/1/3/5/2/135297843/32542f2.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwikiw/heqiaje/31658098337.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/4124100.pdfIn PDF document text
    • https://cdn.sqhk.co/zivunegas/mBtrhai/screen_time_parental_control_app_review.pdfIn PDF document text
    • https://cdn.sqhk.co/lujobitazeku/hihfhRo/wojasududimasisifa.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/c4ffe87a073099.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/ji9Sjas/cold_or_hot_rolled_sheet_metal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_53bd05b1f7d748dca30b9abd9d8d529f.pdf?index=trueIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_a4d7268638664159815d5a01778028a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palevijuj/62099375427.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/riwig.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_8cac1c6187c34fcd811a58dfdf5aea07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/78501604556.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_094503f0eb09409fb6f8dbffa4071a4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patilawasu/paxodinuxutezeduxisikug.pdfIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_fcf36650f4ce4a94bf8cd50849a8c4f4.pdf?index=trueIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_568fdf81f36b45c1adc78af1953a4a1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xojafemori/58729970737.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_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 4800 bytes
SHA-256: 5d68591c28dbb5f4cd6868c2dfd8606e35b424d1ea713a99354cc91d97f6f52c
font_01_sfnt_off00011432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 10504 bytes
SHA-256: 2b0daa15c86ee34061f40f2be5e1ae68c6908b611651ed11325dd414396f26da