Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa9e095aa2a6b8e…

MALICIOUS

PDF

90.0 KB Created: 2021-03-01 19:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b2362349a8a56e300dc6fa93baf9031 SHA-1: d25960dcd637844e4e754c54162d53899a69c390 SHA-256: 4aa9e095aa2a6b8e4d44af01184daddfc8ccf14890bdddd352ade81448bc162a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and the ML classifier strongly suggests maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=can+u+use+ps3+remote+on+ps4
    • http://iranomics.com/lafowatikonurowadixakowikuxsm.pdf
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/a273d17473a9.pdf
    • http://grinallex.shop/wallpaper_hd_1920x1080_pc0k2ys.pdf
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/sudira.pdf
    • https://cdn-cms.f-static.net/uploads/4370560/normal_6011d779b1c8a.pdf
    • https://cdn-cms.f-static.net/uploads/4467912/normal_600ace6591482.pdf
    • https://static.s123-cdn-static.com/uploads/4443372/normal_600615df713c5.pdf
    • http://helplnstagramoffice.com/baby_boss_2_full_movie_freekirdh.pdf
    • http://bristol-yalta.run/monteverdi_cantate_domino_sheet_musicv7xaa.pdf
    • http://onlyforyou.space/giwegez8zh1x.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vavapekadoliti/hang_on_little_tomato_lead_sheet.pdf
    • https://s3.amazonaws.com/vovopafubipu/52267292133.pdf
    • https://s3.amazonaws.com/saxefi/daxolusiwojabusozejo.pdf
    • https://s3.amazonaws.com/patilawasu/laxegitokovixa.pdf
    • https://s3.amazonaws.com/wifukedot/xunewanivuzewokixanirutu.pdf
    • https://s3.amazonaws.com/forupokisip/82698929297.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_off00012002.bin
18ef7db0309be87fe1d3eae79f1c43a8b71b54d2aa404a8fe374baacf8234cc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 5092 bytes
font_01_sfnt_off0001313d.bin
8d842acc95a200d3bbca65e8bb81308057d6a88e9dd5c31a46d54a8aa1e85a42
pdf-font-stream PDF embedded font (sfnt) at offset 0x1313D 12496 bytes