Malicious PDF — malware analysis report

Static analysis result for SHA-256 6390095c0770b950…

MALICIOUS

PDF

63.2 KB Created: 2020-11-19 21:33:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 520b91d68382d464b1d8153b63da549d SHA-1: 1f0170e3bf747b286184c02e716e2b9d4ecdd952 SHA-256: 6390095c0770b9506e08e6b237c685e42ebf73a387e998ec90276a9e6b2797e7
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a high likelihood of malicious intent, aiming to drive traffic to potentially harmful sites. The ML classifier and ClamAV detection further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=valentines+day+images+free+download+hd
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/bemapinalozad.pdf
    • https://judixanasagik.weebly.com/uploads/1/3/4/6/134688655/sagagaxakulepu.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1109957.pdf
    • https://dolufuweg.weebly.com/uploads/1/3/4/6/134626051/369a17.pdf
    • https://fadusibolene.weebly.com/uploads/1/3/4/0/134042843/wanopafewusibu.pdf
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/fegimopibi.pdf
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/005cd4960.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/54685a4c-bcab-4144-85b4-7b241c96f464/48858616723.pdf
    • https://s3.amazonaws.com/lodazojamuva/bumasolesesikobeben.pdf
    • https://s3.amazonaws.com/jemazejodep/kalender_2018_mit_kw.pdf
    • https://s3.amazonaws.com/fidefofudi/ninja_painter_unblocked.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/audit_procedures.pdf
    • https://s3.amazonaws.com/toguvaju/harmony_hall_piano_solo_sheet_music.pdf
    • https://s3.amazonaws.com/bagisi/hampton_bay_ceiling_fan_with_remote_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9d5.bin
317c89fa11e9d700fa3687e071e66c195f175988fc23a0f6e5d7cb53d64adc28
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D5 5480 bytes
font_01_sfnt_off0000cc68.bin
f48bf454c6fa91e92806bdad56a07a67a01c701f9dbe342e831f023bd3b12339
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC68 10444 bytes