Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab9032abce32b89…

MALICIOUS

PDF

61.7 KB Created: 2020-11-17 20:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5a8630fac9902e151a149fe650beb6c SHA-1: 17b85857509866d84a114c0a41b9106ec355211e SHA-256: 5ab9032abce32b89b74df6f630917e2686cb5c2111ae2e1e6cddefd23310b232
214 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to downloading content. The presence of numerous PDF links, including a link farm, indicates a phishing or redirection attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=hyper+dbz+characters+download
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/6767951.pdf
    • https://nulejifoxomopik.weebly.com/uploads/1/3/1/4/131437436/siginowawokoraxoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sasufufa/70410483747.pdf
    • https://s3.amazonaws.com/dumupa/19432105403.pdf
    • https://s3.amazonaws.com/zirojopemup/chapter_27_to_kill_a_mockingbird.pdf
    • https://s3.amazonaws.com/risisipajole/algebra_1_memes.pdf
    • https://s3.amazonaws.com/mipizaju/golf_gift_basket_ideas_for_ladies.pdf
    • https://s3.amazonaws.com/sukedil/jumutavozademizu.pdf
    • https://s3.amazonaws.com/sugaguxagu/autocad_manual_2007.pdf
    • https://s3.amazonaws.com/kavitokolezub/xibibutawasupafisazu.pdf
    • https://uploads.strikinglycdn.com/files/a58091cc-e970-4255-b2f6-5c6217721025/pevejotatojekonutevobexu.pdf
    • https://uploads.strikinglycdn.com/files/54eb0ab9-cf52-4210-86bc-74dc93757a1d/bovosefuranosanakuviwo.pdf
    • https://s3.amazonaws.com/zuxadol/holt_sociology_textbook.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_off0000b4e2.bin
41cabc070c52558b58dfb6dc305e9c2f5524eddf84fa0e14c29e421763b2e5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E2 5508 bytes
font_01_sfnt_off0000c7ad.bin
758b995bd6f3f1f4eb1947cde75493815688e8c647d24ba1055ecc34ed310e7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AD 10100 bytes