Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b43d22fa00a9b5…

MALICIOUS

PDF

79.9 KB Created: 2020-11-25 18:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b9add47bb59bcdc4101a7d33a7deea0c SHA-1: 87122e7922817aa654e3be2fb604e39df7037fe7 SHA-256: c5b43d22fa00a9b59a379745774db44aed08bbe3a290ee0244311d45e7b5cca5
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least two identified as pointing to known malicious redirectors or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffking.ru/123?utm_term=alloy+plate+farming+warframe+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5f884e322dd19.pdfIn PDF document text
    • https://lemarowaverixax.weebly.com/uploads/1/3/4/3/134371099/4880416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_5fa8d631ac518.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/e360e447ef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_5f937c9996079.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/describir_a_una_persona_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/opera_mobile_apk_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/eso_culture_clash_favor_for_sapiarch.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/ncaa_football_playoffs_2020_dates.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/30132850631.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e243.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE243 15652 bytes
SHA-256: c79ef44801aad568ab8b3dcf110ccb04513b3306646f3b1c3d1009049cb4c912
font_00_sfnt_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 5500 bytes
SHA-256: 423a1498ac1856645742f08fe1d68ba341d94ec3d6c70c8b9b01f95b4d3ee4ec
font_02_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 11032 bytes
SHA-256: 514c1125603528dafae1ced82ab41cbf8ed81ea726c926eac02fe2d7ab2df081

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