Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a364acbd9b3121…

MALICIOUS

PDF

83.6 KB Created: 2021-01-17 18:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 38a6e30b05db7c02a6142b25f5949f3d SHA-1: 54b9f075531428a3a8ef8b317339c2083f617b42 SHA-256: 73a364acbd9b3121073334c711d85e91057af5603687e3f6d40c22cc8ef59d64
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 pointing to PDFs hosted on S3 buckets and other file-sharing services, indicative of a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://traffine.ru/123?utm_term=fair+contracting+foundation PDF link annotation
    • https://jakazopafekitab.weebly.com/uploads/1/3/4/6/134632018/zabemi_gisezuwuve.pdfIn PDF document text
    • https://site-1209772.mozfiles.com/files/1209772/expression_of_interest_letter_template_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480588/normal_5fbec1288aa8f.pdfIn PDF document text
    • https://site-1168130.mozfiles.com/files/1168130/toxicwap_2018_songs.pdfIn PDF document text
    • https://jodajapiguzok.weebly.com/uploads/1/3/2/7/132710756/sagawajomozi.pdfIn PDF document text
    • https://site-1179563.mozfiles.com/files/1179563/mafunodizomoli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5feee87b859b9.pdfIn PDF document text
    • https://fevulawem.weebly.com/uploads/1/3/4/7/134714475/0258f807073.pdfIn PDF document text
    • https://nuzefamulazoxiz.weebly.com/uploads/1/3/4/5/134582777/856d7b7c5e0efbb.pdfIn PDF document text
    • https://site-1176701.mozfiles.com/files/1176701/jutubatip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455902/normal_5ff6a7677c97f.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/a3328319.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/57614373552.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/19294197934.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/setegawit.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/sojusuderorulekokasepiro.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/cateye_velo_wireless_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/tegedoninojaribawew.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/11422852703.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/bozaruvimogezotu.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/79013965420.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e2ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE2AD 12684 bytes
SHA-256: 528d785863d0d174c5a5b5b7f017b87f9fbf4f9bb0370c8da11fc00ace6e9622
font_00_sfnt_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 4936 bytes
SHA-256: b7ed66537db0fcdcfbff626e5b048a7b1477f59bb840c9af2971a3490875313e
font_02_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 10632 bytes
SHA-256: 6979b4e60db39904e2a6c2b2b77ee6aa6b28b0c59493fe8aaabbb43800d50b29
font_03_sfnt_off00012b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B34 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501