Malicious PDF — malware analysis report

Static analysis result for SHA-256 adca3506c4c76b81…

MALICIOUS

PDF

63.9 KB Created: 2021-01-10 01:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a3a330abf124df8196704856802a1ff7 SHA-1: a3a8c22b5e1db12f4045087e768559daa5ff155c SHA-256: adca3506c4c76b81af72163c1947fb208f7c8b704b11fff847f3430986e8fb4e
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'traffking.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, some of which are hosted on AWS S3 buckets. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or trojan-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/aws?utm_term=template+bingo+game In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5fb462b14de87.pdfIn PDF document text
    • https://site-1168346.mozfiles.com/files/1168346/mifedusexipovavu.pdfIn PDF document text
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/3359960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_5f9d26f9daa61.pdfIn PDF document text
    • https://dadekojulaza.weebly.com/uploads/1/3/4/3/134320805/9440932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486983/normal_5fcaa21904fce.pdfIn PDF document text
    • https://site-1168360.mozfiles.com/files/1168360/zezisi.pdfIn PDF document text
    • https://site-1223236.mozfiles.com/files/1223236/nike_basketball_throwback_shorts.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/2864427.pdfIn PDF document text
    • https://site-1180978.mozfiles.com/files/1180978/microsoft_teams_connection_issues.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pasawe/information_secretary_meaning_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/sudden_feeling_of_excitement_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/flicka_2006_full_movie_123movies.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/aarum_kaanathe_allu_ramachandran_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB544 4744 bytes
SHA-256: 5e7d198833146821cdd8bb260355de12de16999c0698dc76fda42236b76ec4c4
font_01_sfnt_off0000c543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC543 9232 bytes
SHA-256: 8301e0908c51a85dae36a66e4201e6b366507c3325329d315f9f0ae3917e49f5
font_02_sfnt_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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