Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad87a961679d1bff…

MALICIOUS

PDF

78.6 KB Created: 2021-03-29 07:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e896cff4f40a68565f9866fc9f81a5a8 SHA-1: c7285a427baeeea76ac3079d56f57f54a793914a SHA-256: ad87a961679d1bff57049e98ebc40fd38a7026b1e8e5d38c4a7a4d918e79e4ab
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially malicious content, possibly for SEO spam or to host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/123?utm_term=google+doc+mail+merge+sheets
    • http://lnstagaram-verifiedbadges-from.com/primeros_auxilios_basicos_segun_la_omsxmh14.pdf
    • https://static.s123-cdn-static.com/uploads/4424666/normal_6003e4cfde428.pdf
    • https://cdn-cms.f-static.net/uploads/4378379/normal_604ec62b1fccf.pdf
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/zawoxuvunakitufumun.pdf
    • https://kaxapajitab.weebly.com/uploads/1/3/4/8/134896246/f8cb6.pdf
    • http://geleostone.online/lee_hammonds_all_new_big_book_of_drawing4sp4g.pdf
    • http://site-shop.xyz/packers_injury_report1ddyt.pdf
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/vobujukamurukosolif.pdf
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/7eb1c9c2e4.pdf
    • https://nizufamira.weebly.com/uploads/1/3/4/3/134310662/41227.pdf
    • https://vebupewisagamuz.weebly.com/uploads/1/3/4/7/134704660/furuzuwubor.pdf
    • https://vobogokofudukig.weebly.com/uploads/1/3/0/7/130775751/da5622a7fa18fb.pdf
    • https://cdn-cms.f-static.net/uploads/4386365/normal_6035b35b1a31b.pdf
    • https://cdn-cms.f-static.net/uploads/4365636/normal_603844c8bd415.pdf
    • https://nivejuva.weebly.com/uploads/1/3/4/7/134713874/9291728.pdf
    • https://cdn-cms.f-static.net/uploads/4485801/normal_603d0dfc24343.pdf
    • https://lufegema.weebly.com/uploads/1/3/4/1/134132410/xigogewuzabuwe.pdf
    • https://gofazawadatefit.weebly.com/uploads/1/3/5/3/135349405/neruwadu.pdf
    • https://fugokepak.weebly.com/uploads/1/3/4/8/134856046/buzilekesibegafonopu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e9c6.bin
d312c2a902e9707d4b6db483f2efc06b834513f81f0b7fa097fe8486ed081516		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 5384 bytes
font_01_sfnt_off0000fbe9.bin
5856e29db1aa25b5e315cfb98ecf2eb17a8c547a6a1eac2988c0b03e59dcacff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 19496 bytes

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