Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af3701bc7c40991…

MALICIOUS

PDF

77.4 KB Created: 2021-02-18 20:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 43e73d6566bb6134cc6bdbe8da9d9e57 SHA-1: b213a88fc84283e11f252b95edacd7757f7e50e7 SHA-256: 5af3701bc7c40991eaa431cd4443ddb58af8f69dc7d4999d7f710ec895e4318f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with one identified as a malicious redirector and another part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure.

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://crophysi.ru/strik?utm_term=sylvia+plath+quotes+about+writing In PDF document text
    • http://fb-ig-copyright.com/glacier_bay_faucet_handle_replacementssjyb.pdfIn PDF document text
    • http://rajebamif.22web.org/xumuzub.pdfIn PDF document text
    • http://nowemuzasam.22web.org/pathologie_de_l_appareil_gnital_masculin.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/tebofuw.pdfIn PDF document text
    • https://bovuzujavus.weebly.com/uploads/1/3/5/3/135326818/18d2907c03162e.pdfIn PDF document text
    • http://idealica-ituficiale.website/keith_haring_la_danse_multicoloregmpbe.pdfIn PDF document text
    • http://raliwoze.iblogger.org/gulebaxux.pdfIn PDF document text
    • https://zotagozugub.weebly.com/uploads/1/3/0/7/130739891/dipirepalop_lowofobifoma.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/wexukufedepim/ziwapizesab.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/63096202882.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/fepumuwenejis.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/nipasopanubexojudolamo.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/motorhome_magazine_2005_dinghy_towing_guide.pdfIn PDF document text
    • http://gevuragerok.epizy.com/88346724641.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_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 5704 bytes
SHA-256: 155c4e1eb2b43f2ce2a3832c17d8e2de53f209f6ff8c590c0b1290ce5a98e121
font_01_sfnt_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 10620 bytes
SHA-256: 4d16e3cd16ff75bc85a7385905b9ecde706b085aee748347a9198170fcf5037f

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