Malicious PDF — malware analysis report

Static analysis result for SHA-256 75545da678f4a4d5…

MALICIOUS

PDF

70.8 KB Created: 2021-02-27 08:21:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b80ad9971b65c6f618c2b3d000cb140b SHA-1: 88ffab112d0b5f79cc916a7adbc0c80bb14bca32 SHA-256: 75545da678f4a4d5a51dab71ebe94b012106f4e933150d7a42da9bd0ac4755fb
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but no clear instructions or lures. The presence of numerous external URIs points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/aws?utm_term=mutants+and+masterminds+free+pdf PDF link annotation
    • https://gomadiwisedewun.weebly.com/uploads/1/3/5/3/135314557/3936905.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/npzhihg/15723740383.pdfIn PDF document text
    • http://aduo5.online/734626887157zaff.pdfIn PDF document text
    • http://legrand-spb.ru/blynk_arduino_tutorialgzfwd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402501/normal_5ff7f3bb1c9a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423471/normal_6000db5f333c3.pdfIn PDF document text
    • http://bemelegevew.22web.org/marvel_movies_coming_out_in_2021_dates.pdfIn PDF document text
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/6317879.pdfIn PDF document text
    • http://mabay.fun/trigonometric_identities_testochif.pdfIn PDF document text
    • https://netevidogewe.weebly.com/uploads/1/3/4/7/134715311/1dd2deda61bf4.pdfIn PDF document text
    • https://dukopovofozevi.weebly.com/uploads/1/3/5/2/135295758/nazuzanedem.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/xgggejh/instagram_likes_and_followers_booster_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483335/normal_6018e78cc7c44.pdfIn PDF document text
    • https://wowumufugijakig.weebly.com/uploads/1/3/0/9/130969685/kumagabonovarux_simozusuxolazi_ruzebupado_beputem.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/kulesopuwoguloxuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410002/normal_60048cdb5f962.pdfIn PDF document text
    • https://tuvukorop.weebly.com/uploads/1/3/1/8/131857527/reregajivafunowe.pdfIn PDF document text
    • http://fitnesspack.net/tasopiribemofotud3koi.pdfIn PDF document text
    • https://kaguleturega.weebly.com/uploads/1/3/4/9/134904612/6563917.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jomobagezib.rf.gd/b._f._skinner_behaviorism.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_off0000d3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 5160 bytes
SHA-256: ca38317612c0516fbdd7d28966d7a946313b97421b498f6f6914be43b056dfea
font_01_sfnt_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 11416 bytes
SHA-256: 6fc93c9bdc20c8d9d8c96af510a9dd44397030c4ab6f76dd880b6fa142b5b3b8

Open this report in the interactive analyzer, or submit your own file for analysis.