Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f44877fe7ea65b0…

MALICIOUS

PDF

60.7 KB Created: 2020-11-11 09:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 3a3bea9daeac8802f69dc63416535c57 SHA-1: 893ba53b1fb9976e7571892013fe97c71aa42d02 SHA-256: 9f44877fe7ea65b08dcb9d433647ec5e8b612f69072b0ec89c17b71631e0a0db
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/wb?keyword=fnaf1%20free%20roam%20ue4%20download In PDF document text
    • https://sarurudadolixo.weebly.com/uploads/1/3/4/6/134644817/ribulob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413475/normal_5fa08376bd4d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5f89d089329fd.pdfIn PDF document text
    • https://jujizifij.weebly.com/uploads/1/3/4/3/134309807/libamireke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5f917402103bf.pdfIn PDF document text
    • https://wofinomedek.weebly.com/uploads/1/3/4/1/134108675/d5eb3b60.pdfIn PDF document text
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/pebalu.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/pezofut/hack_block_city_wars.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/movie_rulz_telugu_2019_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/present_indefinite_tense_exercises_in_urdu_to_english.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/vudijigubexonesiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a225693e-3d2a-48a3-a28d-bf5b6428fd41/43231424763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa74d1e9-c04a-4c6d-b7cf-424e33682fec/popsicle_stick_tower_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3fffda-e63d-4470-a9b9-c80493a05cf8/36962431552.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_off0000b37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37D 5060 bytes
SHA-256: 5a83ebbf0d8f97b0a1a01a5bb849c618be6a153c34c1029b44fd2fb051e86ca0
font_01_sfnt_off0000c4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BD 9740 bytes
SHA-256: 9bcd05e538f210fcb3bb713c5a5b6e80dc4230af4f6500f14e807c96c244925f