Malicious PDF — malware analysis report

Static analysis result for SHA-256 49667f8d6102173b…

MALICIOUS

PDF

93.2 KB Created: 2021-03-21 10:31:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef460c613e538cf087a084c640250344 SHA-1: d43638c1f90e8ef5435015463051d4a27090413d SHA-256: 49667f8d6102173b86a2fb08a239af278e6d946cb09ecd18bca0a22843234afd
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, with one pointing to 'https://zajinet.ru/award?keyword=agricultural+engineering+pdf', suggesting a phishing or SEO-based lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=agricultural+engineering+pdf
    • http://afracheat9.xyz/79680726806hwwpt.pdf
    • http://losinglotterynumbers.com/changing_the_subject_definition_mathsya7g1.pdf
    • http://shoppingyxplus.xyz/arkansas_game_and_fish_annual_reportx6f1e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fejakixoweka/68383746745.pdf
    • https://s3.amazonaws.com/bupijila/goxokususogumebogivak.pdf
    • https://c4647614-9ff8-4b00-b819-08dc938bd166.filesusr.com/ugd/5d3f24_a586e9151cd8464399ab010c4170c790.pdf?index=true
    • https://s3.amazonaws.com/nigimul/trichiasis_adalah.pdf
    • https://s3.amazonaws.com/wutezigojuxi/zawodifubupogomewetowen.pdf
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_4b45e76079a74e15a864382700ce70c5.pdf?index=true
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_2694cd78f5da430cb2b421b3b5b51b81.pdf?index=true
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_8150fecb31614e4fb7344ec5ee23987d.pdf?index=true
    • https://s3.amazonaws.com/bufexa/lalomalutemizad.pdf
    • https://s3.amazonaws.com/napejaxosinages/32965389639.pdf
    • https://s3.amazonaws.com/lonozote/94147171974.pdf
    • https://s3.amazonaws.com/fejatepudopito/teaching_job_cover_letter_sample.pdf
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_2f0de89538eb40a19302260f66322a66.pdf?index=true
    • http://gilemexuwef.epizy.com/83874614486.pdf
    • https://s3.amazonaws.com/migivewuwe/rosafujanewudinugel.pdf
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_bbb8e71b80ec493c9f951413861dedf1.pdf?index=true
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_d52436ca369943238cd2d23ad3e4170d.pdf?index=true
    • http://kelawezup.rf.gd/killing_the_black_body_chapter_2.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123a0.bin
181036b73301fedd58f4ef97e17d7fa8ec4e5e0ddc9b4b46f072df46c377f218		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 4908 bytes
font_01_sfnt_off00013457.bin
c81e641a37e98602475460091ec58a1e7e18acb66395506946946be85904046f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 10808 bytes
font_02_sfnt_off0001594c.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1594C 4324 bytes

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