Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9ca661a8fa6fe2…

MALICIOUS

PDF

76.7 KB Created: 2021-05-20 05:39:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2991cbf96616e55363459f51c4fb6533 SHA-1: 220521f5ac3c1e24222961b6f181556aaab839e7 SHA-256: 1d9ca661a8fa6fe2f5e0460fc6497fb5fc18bb02e08a8f0c8442157b201be4c1
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to a redirector URL associated with SEO manipulation and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. No scripts were extracted, but the PDF structure and embedded links suggest a social engineering attack to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/strik?utm_term=how+to+make+coding+scripts+for+games PDF link annotation
    • https://vokijovagugudis.weebly.com/uploads/1/3/0/7/130776016/kivebajovonuma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422161/normal_5fe3d78e3a5cb.pdfIn PDF document text
    • https://rovividupezudu.weebly.com/uploads/1/3/4/3/134373795/4466547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455902/normal_6008cddfa90f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_605258917c9b6.pdfIn PDF document text
    • https://lorudopop.weebly.com/uploads/1/3/4/3/134315835/9648925.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/molagijis_bupovemefusafa_takisodosuzo_sulizipulus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_601e807778884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_603ba2268f6cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481059/normal_5fc992a245bc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494436/normal_604d2023eb4cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5fdaac7785526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f6d1af-70cb-47eb-9777-4e53ae0b7ff8/33700860694.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/falciform_ligament_football_sign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee85cda9-0fdf-4237-afd1-71eb35b6ca34/22601070996.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/87321445723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c9fc6e4-8e44-4419-9e54-f99b6316fa28/folusasog.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/gamun.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/luveduroverilu.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/kulorukijoduzifegapojozom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97388dc5-efaa-424e-ae86-813b7c7ca343/widemipelajobikebora.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/what_are_some_examples_of_professional_development_goals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d7849a-ab39-4da0-9e5b-c372c54e9357/what_i_learned_in_statistics_and_probability.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_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 5560 bytes
SHA-256: 1c713bbb71bd4f487fa46f9e47d90edb17c474906feffec6cc183bbb0fe479fc
font_01_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 11404 bytes
SHA-256: ae4389086759a5ffe11ab4accdcc91d8faa7963447dc6ef875c778846816d261