Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f35e264e3b8520e…

MALICIOUS

PDF

75.1 KB Created: 2021-01-14 05:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 04f5d51cc87f5b08742a30c6482384aa SHA-1: ee7c2295cac6fbaf0fdb5e8fbb41d2379766ec44 SHA-256: 5f35e264e3b8520e2988cff9210ad80992d730749b036d55e821fdd2efe4df2b
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to reference 'Vsco x free apk latest version', suggesting a lure for free software. The presence of numerous external PDF links further indicates a link farm or redirection strategy. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=vsco+x+free+apk+latest+version In PDF document text
    • https://nuzolegan.weebly.com/uploads/1/3/4/5/134576582/kipelonatedof-panen-fukozofiwix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414848/normal_5fcd9e498fdef.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/viragaxinumimikag.pdfIn PDF document text
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/4288236.pdfIn PDF document text
    • https://site-1176112.mozfiles.com/files/1176112/honda_pressure_washer_pump_oil_change.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450517/normal_5fcbdffd8c03a.pdfIn PDF document text
    • https://site-1196780.mozfiles.com/files/1196780/62937913045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_5faa59cf58fed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f97e5a06583e.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/ef00f8273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f88123ad9c59.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/fekazudabo/can_you_dye_carpet_on_the_floor.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/apache_kafka_server.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/fitemur.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/vofugol.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/whatsapp_for_nokia_asha_501_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/97901893410.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_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 5168 bytes
SHA-256: 39fdea445c0a79e22fe26279a4037bbbeed42aeec6708c4c149940ed2cf26ac6
font_01_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 10980 bytes
SHA-256: b452c6e855c65ec5db3a909821e9f20ef61bb8a42a9379fc0e4983a0eddd80a7

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