Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4224af1d4e8937…

MALICIOUS

PDF

78.7 KB Created: 2020-11-22 02:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9cc56d143aea894c3bd3c4ddae8e84c6 SHA-1: 99e264f25f699386b851b89729bf4ac671d87f8c SHA-256: af4224af1d4e89376dd419d61568a07c511ec2c380411fd8622e948b14ee3a40
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the document contains a large number of external links, with one prominent link pointing to 'traffnew.ru'. The presence of a 'download button' heuristic suggests a social engineering lure to trick the user into clicking these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://traffnew.ru/123?utm_term=watercolor+clock+sketch PDF link annotation
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/3081215.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/4794125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444366/normal_5fa247f5389a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471114/normal_5fa58cbf17b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413007/normal_5fa4588ebf7b9.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/dcd4dee.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/b065a59d-f589-4be0-a72a-e83ea9aeb431/godanonigozezewabipokadif.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/left_humerus_bone_markings.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/mod_menu_roblox_apk_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/ct_capitol_news_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a8900f-b5be-4384-b978-ec73cd1b3124/cvs_locations_bronx_ny.pdfIn PDF document text
    • https://s3.amazonaws.com/lodunixodetum/14257276263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/512a0e50-2e16-4a8c-a89a-598a18eb6d3f/white_coat_investor_free_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 4964 bytes
SHA-256: 8cae591805534877b8667cfa057e4c8332f15dde6a7c765a5e21d71a32a7500e
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 10712 bytes
SHA-256: c734f5b88896cc9f02355f7b18a41b541ddcb8b99d415e33b5e677e793e70652
font_02_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939

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