Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc58f1ce85ed0dc…

MALICIOUS

PDF

70.3 KB Created: 2020-11-10 20:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 685a67d6aa65d50a63bd77a401bda4ab SHA-1: 9a140a259da59d10a9b8331f924aa579bfd2816b SHA-256: dfc58f1ce85ed0dcb328edb36e81ac4833a375778cca2a15327605a608cd5fd7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL that directs users to a suspicious domain, likely for further exploitation. The document body, though heavily obfuscated, suggests a lure related to academic content to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://traffnew.ru/123?keyword=codominance+problems+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420244/normal_5fa88200d3459.pdfIn PDF document text
    • https://taruzabob.weebly.com/uploads/1/3/4/4/134493447/d2a9060d3e03345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5fa0818f0c085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f870a89554b2.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/e400e0bb-277b-4a10-9fdd-2b4a437ac6cd/pukivizamewatepivukepos.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/free_dungeon_master_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/nissan_cube_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/war_robots_hack_amazon_fire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a322d9-c1b3-4177-81f1-5eed523d009a/13878576776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797e5cbb-aef6-4cc3-82d2-dc6dc09ad731/71492863743.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/wordly_wise_3000_book_8_lesson_14.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_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 5452 bytes
SHA-256: 0a915600139a04215b29d623c6bfcd79c7763838b60dc5fa4203a53c6e347eb1
font_01_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 9500 bytes
SHA-256: 1fc7c0cdc964cbce58eaee77aae9a030a68f50c5b2304c902760c62e672b87f6