Malicious PDF — malware analysis report

Static analysis result for SHA-256 1778a2167fbdf044…

MALICIOUS

PDF

77.9 KB Created: 2021-03-01 09:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7990de2842a55230c48db5c481fed414 SHA-1: ef58fc595ae604601551ce96057b4a28ed8947c6 SHA-256: 1778a2167fbdf044b183f1667838bb1e34dc8f53d843f4d7aca0cf61d0d062c7
176 Risk Score

Malware Insights

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

The sample is a PDF file that contains a large number of external links, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The malformed stream length heuristic further supports exploitation attempts within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://resalured.ru/strik?utm_term=the+heirs+1+april+2020 PDF link annotation
    • http://lebedugipul.mywebcommunity.org/hp_laserjet_p1102w_setup_without_cd.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/bAhihhs/e_with_accent_grave.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/AHmkhhS/happier_living_west_hollywood_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/jjhd7jj/baby_sleeping_music_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387406/normal_60260c5c2483a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374700/normal_5fc8001b520d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_601ddeb32c98b.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/ihjfOHO/server_job_description_restaurant.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/jqoecy9/rawisur.pdfIn PDF document text
    • https://patijunig.weebly.com/uploads/1/3/0/9/130969449/1c10c.pdfIn PDF document text
    • https://natitapa.weebly.com/uploads/1/3/1/3/131379406/8f7616a11e7abed.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/ibiaihw/zoluviserazeposusa.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/ijijfji/66300169106.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/hhdhc89/dezepisixopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namavorudil.epizy.com/lavadoseg.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_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 5180 bytes
SHA-256: bd8d273c0de4bb1e4389eebfeea8e1b818231033381ead81b36ecaf63f869880
font_01_sfnt_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 11300 bytes
SHA-256: 7a82c7f9d499ebc05c15f19218b2499e2f482dfff60a16f8522b17b46e3d4a81

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