Malicious PDF — malware analysis report

Static analysis result for SHA-256 339dc83c75932e3e…

MALICIOUS

PDF

82.1 KB Created: 2020-11-20 01:50:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a926bfc512e78b97fa66cb001bc0451e SHA-1: d7316da773f463964f748ae0162ad714b5c4e9ae SHA-256: 339dc83c75932e3ed576ecc090e3b4b4ac3ea19c63373d884c1b696c298be7d4
164 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 of which appear to be part of a link farm designed to attract search engine traffic. One of the primary URLs, 'https://trafficel.ru/strik?utm_term=office+365+for+dummies+pdf+free+download', suggests a phishing or scam attempt by luring users with a fake free download. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/strik?utm_term=office+365+for+dummies+pdf+free+download PDF link annotation
    • https://pazaduzot.weebly.com/uploads/1/3/4/4/134473777/e7217d9f63d.pdfIn PDF document text
    • https://vagonegasix.weebly.com/uploads/1/3/1/4/131482995/temupijibon.pdfIn PDF document text
    • https://radisowe.weebly.com/uploads/1/3/4/3/134366404/8de8b.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/d9d044ae1f4a685.pdfIn PDF document text
    • https://naletonuve.weebly.com/uploads/1/3/4/3/134381452/gapoganajus.pdfIn PDF document text
    • https://wusinetowaje.weebly.com/uploads/1/3/4/4/134471696/tekure.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/ruzaganog/ap_world_history_unit_1_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/gomabux.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/29425035995.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/neuralgia_de_arnold.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894a0d8a-87a0-459e-9ae2-1e6d2d7a091a/44459976579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1ba215-da3a-49aa-9cae-ccc8f4d1a40b/clue_jr_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/sejupavirixe.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_off0001013f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 5860 bytes
SHA-256: 7ee01b096bed96faa1c961871a9f7a693387dd6d7e2be196af9258718f50c76b
font_01_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 11180 bytes
SHA-256: 037eda30efbcdafed1b204bddf46caee0c29e640e6b48f75bd2f7c025e396db2

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