Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af1ebe35dd3d40b…

MALICIOUS

PDF

71.8 KB Created: 2020-12-28 13:32:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5211d2e2cf33720f56d08ea3f15591c8 SHA-1: 4e082f35db943b2b306c06af58fa86d64460524f SHA-256: 3af1ebe35dd3d40b0580de0a3933ecc25e664f6a64ef3cc7a515f4d2eb8acc2b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 PDF files hosted on various platforms, indicative of a link farm or SEO poisoning tactic. The primary URL, 'https://trafffi.ru/strik?utm_term=zombie+run+game+unblocked', suggests a lure related to a game. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant. No scripts were extracted, but the extensive link farm and the nature of the primary URL strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=zombie+run+game+unblocked PDF link annotation
    • https://korenumotijele.weebly.com/uploads/1/3/4/6/134687452/polikedurux_nowinolukuredok_zadorosege.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/jogiri_wexop.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/2d7f439.pdfIn PDF document text
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/xinorumolufemot.pdfIn PDF document text
    • https://bumokodujexub.weebly.com/uploads/1/3/4/5/134595190/vokuravojos-zedafojaga-bawinabutex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/setikizo/49340811714.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/linetopegizigijefirufalab.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/mindy_kaling_books_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a06c32-6f10-4739-8737-c82da7ccee82/kizinajeji.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02C 5044 bytes
SHA-256: 5763c0c5991c12a222baf192aea61dac7fca4219dbce08940d8a88ecb618dfc1
font_01_sfnt_off0000e12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 10284 bytes
SHA-256: 507646d1d47ca68e9b9801996be18a3209e432b4cf735d34f5f7ecb7ca535b42
font_02_sfnt_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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