Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ce72061c3f1a6d…

MALICIOUS

PDF

63.9 KB Created: 2020-12-16 10:28:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e195de367ae4cf2e3bd791203df46a13 SHA-1: d436ee141f52b719438b729953705acfc9c128fe SHA-256: 07ce72061c3f1a6dba5dd2a28d13a39fc247068fd53056ec62104d8608d78788
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links pointing to disposable domains, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs and the link farm structure suggest an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://trafffi.ru/123?utm_term=the+oxygen+advantage+audiobook
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/mosiwavuzuv.pdf
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5fb33853f3617.pdf
    • https://cdn-cms.f-static.net/uploads/4386354/normal_5fbb30140e673.pdf
    • https://varovofuzurido.weebly.com/uploads/1/3/4/5/134598094/najibosefa_fufiwejobiz.pdf
    • https://jufozovujibozom.weebly.com/uploads/1/3/4/3/134360308/sakapag-dawutibigit-mimipitotij-ruworedabu.pdf
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/domujexukade.pdf
    • https://sevurefomofib.weebly.com/uploads/1/3/4/4/134451272/wolonazeluki-parov-topapa-nifon.pdf
    • https://durezeneb.weebly.com/uploads/1/3/4/2/134235042/rogizix-lipevujovajaf.pdf
    • https://luvatuxi.weebly.com/uploads/1/3/4/3/134321506/xuvunebofa.pdf
    • https://sozufozixukuba.weebly.com/uploads/1/3/4/7/134730132/ladetelozirobitotu.pdf
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/xaxutuxemisemavatas.pdf
    • https://cdn-cms.f-static.net/uploads/4426675/normal_5faa4214a2aeb.pdf
    • https://static.s123-cdn-static.com/uploads/4421471/normal_5fc7c8d477578.pdf
    • https://vigakamodibit.weebly.com/uploads/1/3/4/7/134770941/kogopamexutokumub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/potevip/49599084799.pdf
    • https://s3.amazonaws.com/vedexajawo/19080343851.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be86.bin
891bab1c2bf1692d3289813f8b4d3d59e2a4e3326aa57c1b5f8f17ae973625b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE86 5164 bytes
font_01_sfnt_off0000d026.bin
fbb1bd874551da8f1630651f3d935050480f6ca9b40e1bba63fe282769be97e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 10272 bytes