Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0944079f732a746…

MALICIOUS

PDF

82.3 KB Created: 2021-03-28 16:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7831d8993f77a63c34b039c5b7f57d65 SHA-1: 7b40702a7d3c3f0d0c48100e593b238a8449cd02 SHA-256: c0944079f732a74614afc1480ca32d002de5faabe447f7525798f47cba571b47
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of a large number of external links, specifically a 'PDF link farm', suggests an attempt to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/wix?keyword=zhloe+aliapoh+ffxiv
    • http://fogatevemawe.22web.org/88112006369.pdf
    • https://cdn.sqhk.co/sidigodoga/pmrShjV/lumaxubodalomifilinigixu.pdf
    • http://wirajamosilun.22web.org/89045961731.pdf
    • https://rezigetofetima.weebly.com/uploads/1/3/1/1/131163738/bopijivupawa.pdf
    • https://puvovajol.weebly.com/uploads/1/3/4/0/134040332/badip-gilulifowugaso-govulikekafopu.pdf
    • http://fomaxos.22web.org/punjab_textbook_english_9th_class.pdf
    • https://cdn.sqhk.co/segenapiza/Liaihii/90993501599.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zizene/vinen.pdf
    • http://didajuna.rf.gd/98839344348.pdf
    • http://numorajigot.epizy.com/how_to_edit_a_in_canva.pdf
    • https://s3.amazonaws.com/kavalukato/pifatabilemalujogigixawib.pdf
    • https://s3.amazonaws.com/rerinago/sample_sql_server_database.pdf
    • https://s3.amazonaws.com/ruzumeb/subject_and_predicate_worksheet_for_5th_grade.pdf
    • http://foxinojale.epizy.com/arbys_value_menu_2021.pdf
    • https://s3.amazonaws.com/kezemiradigu/gre_subject_test_cost_india.pdf
    • https://s3.amazonaws.com/xebuvuwov/kodakemubofakareraguxo.pdf
    • http://xozadopuwol.rf.gd/what_is_the_difference_between_oracle_12c_and_19c.pdf
    • https://s3.amazonaws.com/belopudevuzuza/negative_exponents_worksheets_grade_8.pdf
    • http://wasuragexoledar.epizy.com/68717471398.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f885.bin
dab0f214033ac1290732b2adc99fc3ed2e4898d02e2a336197a0bef4fc8d4b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF885 3284 bytes
font_01_sfnt_off0001044b.bin
10d55fcba520700a35a1ac31e0fe752a09d91b88dffcffdf37185caef363027b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 4800 bytes
font_02_sfnt_off000114af.bin
9f4159e59ba4a7dbcc0aba6e6b2f383d4d27ff98bb03bb10f6ce22ae1dd2da00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 11180 bytes

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