Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d1eda7a686f4ab…

MALICIOUS

PDF

68.7 KB Created: 2020-12-25 23:15:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8cfd309000c2a11ce8e8c4020640c750 SHA-1: d5b2ed9ec170241798cbcbad99ed3631cc6ee4d4 SHA-256: 16d1eda7a686f4ab655415b403fb35273d5b4ed722efc31603c0a99fd01d00e2
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, with one pointing to 'https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/lanadez.pdf', likely to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a game level title, suggesting a lure to disguise the malicious intent.

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
  • 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://trafffi.ru/strik?utm_term=off+the+rails+3d+level+43 PDF link annotation
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/lanadez.pdfIn PDF document text
    • https://rezilatepupegox.weebly.com/uploads/1/3/5/3/135318796/dukixobawum.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/a5796934-649c-4068-be89-ffe25267ad40/debuwesovizibifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7030708-f194-429f-99c5-31ae93bdbec3/81693896266.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/jalefubepiloxefugas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e3d968-9e71-4a16-addd-ffc9eff34c7e/hernia_inguinal_slideshare.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/meant_to_be_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d193417-86b8-45de-93a1-4bba449d8c37/wifujejuli.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/baby_browning_25_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/likela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ae2ff7-0f43-4fe7-b53b-1c1ac31d8107/11896880923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b062ae-905f-492b-bae2-71e6fea569b0/sly_cooper_collection_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/wulokoxikaporekovepibumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b38cf5-3ab1-4b13-8b09-b96dcadafa6a/fundamentals_of_groundwater_schwartz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 5336 bytes
SHA-256: e56be7b96b9f7c0f2dff727c1ba604caaa345d28f4fc8e15bedd7056e524b702
font_01_sfnt_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 10252 bytes
SHA-256: 438d4754537cf19486360b87d5bb3c33b009b442b375d356dcc41191aee406f5

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