Malicious PDF — malware analysis report

Static analysis result for SHA-256 71052a38935ac648…

MALICIOUS

PDF

82.3 KB Created: 2020-11-29 16:10:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 47826ab19820e51ccdcedb151331989d SHA-1: e650c79382c34cdc7efd53111ad98a1aa98b5edb SHA-256: 71052a38935ac6481c5062c8fa7fa142a92ab6b961569a7fb9a69c8e91d3efa0
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'traffmen.ru'. Additionally, it exhibits a PDF link farm heuristic, suggesting an attempt to distribute or lure users to multiple PDF resources. The ML classifier also strongly flagged this PDF as malicious, aligning with the ClamAV detection of 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure indicate a phishing or malicious redirection attempt.

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
  • 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.
  • 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://traffmen.ru/123?utm_term=atlas+ti+cloud In PDF document text
    • https://damuxuru.weebly.com/uploads/1/3/4/0/134040763/latebijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_5fae9cc928657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_5fa11b321c7e0.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/kudowo/86920406483.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/5500546428.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/gobosadufoxufasidevuperew.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/mofomuzanisupu.pdfIn PDF document text
    • https://s3.amazonaws.com/wisatutadi/first_grade_math_addition_word_problems_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad3f5b35-516b-4643-b6db-7ff6977476c6/tawaxiwiniziris.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/dirowukuwekedugikasepen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0f9cd6-aaba-472a-9f23-33c519de3ee2/dirt_bike_themed_party_favor.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010dc4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10DC4 26268 bytes
SHA-256: d208ec635f31b2825d700401505cfada5cb29965e21fa66814f1332739ac26f7
font_00_sfnt_off0000d942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD942 4824 bytes
SHA-256: c0728567e87bbfd06e6a179f37644edcc051d4d2c18730dc96828349dd92c22a
font_01_sfnt_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 11016 bytes
SHA-256: 5666047c0538c926c45399985dc2ec064002d9cecb728ce785728f49e990228f

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