Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e3bd0ccbe54761…

MALICIOUS

PDF

61.4 KB Created: 2020-11-20 23:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed4d211c307ef90f2a443332ccee0fd5 SHA-1: 156918209938d12077d154831bab87fd0f37103e SHA-256: 72e3bd0ccbe547613b90c779a010996cce0dfc98bc06c88f013e05865f891627
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious, exhibiting characteristics of a link farm designed to redirect users to numerous external websites. The document body, though partially corrupted, suggests a lure related to 'worksheet answers', and the presence of multiple external URIs, including those hosted on disposable domains like weebly.com, indicates a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/aws?utm_term=how+to+make+a+cladogram+worksheet+answers
    • https://zazejisodixad.weebly.com/uploads/1/3/4/3/134359446/papoxezufene.pdf
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/1127a31.pdf
    • https://cdn-cms.f-static.net/uploads/4409110/normal_5faa1f6f15a00.pdf
    • https://tubefirijivu.weebly.com/uploads/1/3/4/3/134351006/zakux.pdf
    • https://dumopodowejuna.weebly.com/uploads/1/3/4/5/134591879/497852.pdf
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/4952957.pdf
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/tomoluvaxebi-gaxiwapoxafet-fuwurinasokab-xanefedirad.pdf
    • https://sufexijim.weebly.com/uploads/1/3/4/6/134679247/59b78fc835e6.pdf
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/1f3164e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jarawaxanivu/atmosphere_drive.pdf
    • https://s3.amazonaws.com/tometubufimopim/us_map_of_states_visited.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_off0000b4ab.bin
5172b2c6c821dbdbd660fccf2dc862cd115846554d5933e9f2a4e199b738d39e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AB 5468 bytes
font_01_sfnt_off0000c71f.bin
8880e1e415205f144ff92088ebecc440537eab63c8b42f344c707ed931b7e87b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC71F 9932 bytes

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