Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b54e90fe650b68…

MALICIOUS

PDF

78.9 KB Created: 2021-04-03 07:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9753b7c393fbe3211c6fcca6b0a2b495 SHA-1: a90c42f433fb952ed50dd4b3bbeae22f24cd1e01 SHA-256: b6b54e90fe650b68baf90a6bb6b4d5a7ddd7c4190fba5ad5c65797c296f506d3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://midufefew.ru/award?keyword=pulse+width+modulation+using+matlab+code+pdf PDF link annotation
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/1048363.pdfIn PDF document text
    • http://gaveguguxa.iblogger.org/logitech_wireless_gamepad_f710_driver_windows_7_download.pdfIn PDF document text
    • https://lefazevi.weebly.com/uploads/1/3/0/8/130873710/d6cfdf95f05b9.pdfIn PDF document text
    • https://tozakewa.weebly.com/uploads/1/3/5/3/135398337/mamuxusurawu.pdfIn PDF document text
    • http://jobavapoxoto.22web.org/41119159220.pdfIn PDF document text
    • https://lirujisigibat.weebly.com/uploads/1/3/0/8/130874608/9005732.pdfIn PDF document text
    • https://lujoduxatodovaw.weebly.com/uploads/1/3/2/3/132302833/4f92073a089f96.pdfIn PDF document text
    • https://betisifi.weebly.com/uploads/1/3/1/4/131438474/dedifunafozogeg.pdfIn PDF document text
    • http://pizovanijeb.22web.org/how_many_questions_are_on_the_cdl_general_knowledge_test_in_texas.pdfIn PDF document text
    • https://tunoworuv.weebly.com/uploads/1/3/4/0/134017870/8373678.pdfIn PDF document text
    • https://fopunideneluw.weebly.com/uploads/1/3/5/9/135965314/420e5bbd5fb0d8.pdfIn PDF document text
    • http://keburej.22web.org/78372706380.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/2714790.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gigezevozaf.epizy.com/97392392717.pdfIn PDF document text
    • http://diturasenupope.epizy.com/japanese_knotweed_identification_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/fijiri.pdfIn PDF document text
    • http://xirakogo.epizy.com/audionet_watt.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/21570507467.pdfIn PDF document text
    • http://tebuwujovu.rf.gd/fokisagusetitosorun.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/photosynthesis_cycle_worksheet.pdfIn PDF document text
    • http://rafodize.rf.gd/arjun_reddy_hd_movie_tamil_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/witolaruguxilerot.pdfIn PDF document text
    • http://zekinipumulo.epizy.com/game_candy_crush_jelly_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/bestar_murphy_bed_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 5588 bytes
SHA-256: 91e1072965ac7a4700a4890aaffd5a28467dab58a6587a1e3e16857006e258fd
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 11100 bytes
SHA-256: b41727331fd817bf930e591af9533ae3905a9c53efc42cc674e348a2027b9345
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176