Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cedcfc4c647c86…

MALICIOUS

PDF

82.5 KB Created: 2021-01-21 10:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6f9b69702a257824c17f15870c904651 SHA-1: ec23f0c7395a833092d78a3b994e85ad4992ad71 SHA-256: a5cedcfc4c647c8613b887ff930be0e8c810662d8ab4e92d000f06cf8173c4e6
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a suspicious 'utm_term' parameter in one of the primary URLs supports a phishing or scam campaign. No scripts were extracted, but the structure suggests a malicious document intended to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://jottigo.ru/aws?utm_term=australian+super+performance+5+years PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484126/normal_5ff30de05e289.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/jbfjeMq/tuvapewiruturewugu.pdfIn PDF document text
    • https://cdn.sqhk.co/liregevo/tBggt5C/86950445906.pdfIn PDF document text
    • https://site-1176577.mozfiles.com/files/1176577/samsung_a20s_stock_wallpapers.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/ghgYiil/35359449770.pdfIn PDF document text
    • https://cdn.sqhk.co/lasetipulos/eQhftA0/tovupenixazamotimafuvabol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_5faedb2a695ac.pdfIn PDF document text
    • https://cdn.sqhk.co/tudobele/Ljeggjd/xipazas.pdfIn PDF document text
    • https://fotofewoxa.weebly.com/uploads/1/3/4/8/134849098/1083073.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/6491248.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/igTjiBI/89666310094.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/tutetexekasegimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f8c6fe599a6d.pdfIn PDF document text
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/lubopijopakoxum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414498/normal_5fb8ec1892fee.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/vighdTE/zejobomoji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gazitif/11986916671.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/79952498081.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/bugs_liker_fb_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/vefumu.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_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 5376 bytes
SHA-256: 5202863a53f24738e39fe7bff671254ebc6f78eda8b68ecc1349893e6ed12ba0
font_01_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 11136 bytes
SHA-256: 8fde01871ecffdb65d648719a1fe58775e2f5419dc6697c2878c8c2c5d886e6e

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