Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab5878ac67ecf55…

MALICIOUS

PDF

82.3 KB Created: 2021-03-24 07:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 923177aaa4950e89b337754f42dc2ad0 SHA-1: 2cdf0e7d9c3eb844bc8335b0140bffd52a45f4fe SHA-256: dab5878ac67ecf55902860a363cebdeff3524e4e40316a246aeae03532e16245
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, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=medical+case+report+format+pdf
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/xududide.pdf
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5ff4dc8f7977a.pdf
    • https://lujomawaki.weebly.com/uploads/1/3/4/5/134577487/legavine.pdf
    • https://waxagenejefud.weebly.com/uploads/1/3/4/7/134712445/dd1f2c19f.pdf
    • https://cdn-cms.f-static.net/uploads/4377408/normal_601b87da30767.pdf
    • http://alkostore.xyz/fajosipogevimcjke.pdf
    • http://form-lnstagramcopyrightservices.com/my_cloud_ex2_setup_softwarefusze.pdf
    • http://summ-green.fun/nujemomotelerobojuvibug1ie0.pdf
    • http://shop-profildoors.ru/ffxiv_machinist_guide_2019bqvph.pdf
    • https://cdn-cms.f-static.net/uploads/4412570/normal_6042041e463f6.pdf
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/1591290.pdf
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/zukogawiwena_bofomota_libagatadu_vepaweluvevow.pdf
    • https://pokekuxabinupar.weebly.com/uploads/1/3/4/0/134016783/7391235.pdf
    • http://esmoney.site/dalipovoxinelatiberepadooypge.pdf
    • https://vopupina.weebly.com/uploads/1/3/1/0/131070761/00e77.pdf
    • https://basalusorur.weebly.com/uploads/1/3/4/6/134661810/af50a89e5.pdf
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/227507445f07.pdf
    • https://dapemoko.weebly.com/uploads/1/3/4/6/134647299/nulekovibili.pdf
    • https://static.s123-cdn-static.com/uploads/4373985/normal_5fe220012fa3a.pdf
    • https://jinizunoluvazo.weebly.com/uploads/1/3/4/5/134592141/kugejimudetis_nonig_fefixoraxegibav_wonunesivokiru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_3ed46ce892ad4267b55d663d040a1415.pdf?index=true
    • https://334e481f-4595-4613-8514-cf1b68b0f675.filesusr.com/ugd/a5bb32_2a6944477c314d469eb05b05cf3ab3c3.pdf?index=true
    • 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_off0000f7db.bin
f8b070ac34abe19f8b4b31e62940505c468c20569f3c86663e5a9e99d4e9a6ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 4988 bytes
font_01_sfnt_off000108cc.bin
b1bb319fa194955beb4b68ebcf9de1447f615496b1ff4db520c22630c8410b6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 10748 bytes
font_02_sfnt_off00012d98.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D98 4324 bytes

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