Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9fdc2484350c10…

MALICIOUS

PDF

76.2 KB Created: 2021-01-05 06:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7c89bc600ece25dd67781b929acdda79 SHA-1: 8f516f96af291aedc6f65ed81597cc8708dfb6c1 SHA-256: 1d9fdc2484350c10807e2aec9de5a2b8eb8f8a8887fd8fb0093bd9a4b9f818c2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary external URL, 'https://trafftec.ru/aws?utm_term=schismatoglottis+calyptrata+pdf', suggests a potential SEO spam or phishing lure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of numerous links points towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://trafftec.ru/aws?utm_term=schismatoglottis+calyptrata+pdf PDF link annotation
    • https://dibuponabax.weebly.com/uploads/1/3/4/3/134340508/5067870.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/denivelujawifajevezu.pdfIn PDF document text
    • https://cdn.sqhk.co/tebolugex/4YVHjeq/37081018535.pdfIn PDF document text
    • https://cdn.sqhk.co/jarutejip/X8Ct8gF/kadebepafe.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/ajd61je/misdemeanor_disorderly_conduct_mn.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/0104ed41-e13d-4005-86c2-de7090d5e7ed/chinese_four_treasures_of_the_study.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/15350780161.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/99950121187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ff329a-28ac-46aa-b6dd-bf0368ec809c/77757464108.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/marked_for_death_shout_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/encyclopedic_dictionary_of_mentalism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0520094-9721-44ee-92f0-684955b31da3/zasojogasanidufavixuz.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/2009_buell_blast_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1533bf2-d4b7-4fdc-94a3-41149574203a/70560880233.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/cbse_guide_grade_7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 3648 bytes
SHA-256: 48e43b5aca45f46ffeca69540119a8e7b60cbb4e08bdaa9bb109de9bea4e1983
font_01_sfnt_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 5776 bytes
SHA-256: de999618e13f1c9664a9c62bd3b29886c7251d6fdf190b4919b2ab5e19b80d37
font_02_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 11188 bytes
SHA-256: 8274bacb5509af926c2e766e637af91a89c742c27646f9c29512dca61717d56f

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