Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aee4c5482af7f2f…

MALICIOUS

PDF

81.5 KB Created: 2020-12-25 22:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f84163e118865751056431cde892aaae SHA-1: c55578d3f3df3f8a417b471a0c453a4c81b5d1f9 SHA-256: 5aee4c5482af7f2f07135578ff7d846b8f43518b89f360a0dc47dc1445ae813a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, directing to various PDF files. One of these links, https://trafficel.ru/123?utm_term=ensenada+mexico+maps, is flagged as unknown reputation and likely serves as a lure or redirect. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

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://trafficel.ru/123?utm_term=ensenada+mexico+maps PDF link annotation
    • https://cdn.sqhk.co/fejavegiwo/4hfJmwk/77393850162.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409827/normal_5fc3c712dddea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_5fa015cb6fea1.pdfIn PDF document text
    • https://cdn.sqhk.co/serojimo/agdghcj/pub_story_bar_renovation_breaker_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406456/normal_5fe465c24075d.pdfIn PDF document text
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/zuxejiviwuves.pdfIn PDF document text
    • https://lubutivewem.weebly.com/uploads/1/3/4/8/134881275/92b7fd33bd4653.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/vonuxagupeduze/kenny_smith_divorce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8c3ce4-78fa-4711-bf5c-f1f99124aac0/a_guide_to_the_present_moment_noah_elkrief.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f02b132-7130-4ecd-ba1b-d1ee05492b66/icd_10_code_for_mrsa_bacteremia.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/dusune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e363cbda-bb8b-475c-8501-fe5715b5392d/xumunomajipetowid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a75e8a1-d0be-4914-bbaa-c4a5b2d58f16/bingo_winner_clipart.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_004_off00010802.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10802 27264 bytes
SHA-256: d7ee2993777dfa8d3d80d7bd6a28f44810b524201b58d7527cc3a7f86fc73a14
font_00_sfnt_off0000d0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EE 5116 bytes
SHA-256: 61a8146e0f58e26a516bb426ff3dcac01deb4e1c02a7385c2d7e1842431a92cc
font_01_sfnt_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 10940 bytes
SHA-256: 768adc1601f10d91d1ed2f4840665f667101c80c138e6ccca9a6208d78676927

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