Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74f5b160e4c4e58…

MALICIOUS

PDF

77.7 KB Created: 2021-02-27 18:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 67183cc9b5471f9d7666ec2979982867 SHA-1: 62f66bababf948a56e098a40f4c4191502372993 SHA-256: a74f5b160e4c4e5843b32b6b5b707bb9a64220de57fe73915fe3169fd08fd10d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a significant number of external links, identified as a link farm, pointing to various domains. The primary URL, https://vilenefex.ru/award?keyword=things+to+buy+for+new+house+checklist, suggests a lure related to shopping or checklists. The heuristic firings indicate this is a malicious PDF, likely used for SEO manipulation or phishing, and ClamAV also detected it as a phishing trojan. No scripts were extracted, but the structure and URLs strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/award?keyword=things+to+buy+for+new+house+checklist PDF link annotation
    • http://gubixazolela.sportsontheweb.net/msica_techno_mix_de_los_80_y_90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469101/normal_6006c751c8ddf.pdfIn PDF document text
    • https://jukejifoka.weebly.com/uploads/1/3/5/3/135311866/jetefure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_6035c6340dd08.pdfIn PDF document text
    • https://zoforute.weebly.com/uploads/1/3/4/3/134352948/datawifiw-buxazidoposisa-zevefamewe-punadanevuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_603016a8378e8.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/2763fd6191e953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5fe60b47bf342.pdfIn PDF document text
    • http://fubikopelemom.mypressonline.com/53422371573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_602782a3d6b1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472773/normal_6025beedc4d99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5fe54ea59eef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_601995af9954a.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/how_to_trade_options_on_td_ameritrade_youtube.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/velafibinirizivepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529977/normal_5fd90eac0c7a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_6039db032ef96.pdfIn PDF document text
    • https://riwewupurudo.weebly.com/uploads/1/3/1/3/131381540/nidokusifajizakex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fetekovabu.onlinewebshop.net/uniden_bearcat_bct15x_software.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 5280 bytes
SHA-256: 683866f418ea288434ddc825729f8a45bb522bae920dc4957b2032cf6fc634ca
font_01_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 10792 bytes
SHA-256: e2af5cba32d3c397b006eee39e04a1ec2b131decc15123c065606918aa844882

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