Malicious PDF — malware analysis report

Static analysis result for SHA-256 608b8606df26fe15…

MALICIOUS

PDF

71.3 KB Created: 2021-06-15 13:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9e683e94bc226e12de164dba022d814 SHA-1: fa52eac147896d9ed18ecf911773a4a8731b6031 SHA-256: 608b8606df26fe159d62e0146aa51a98569bd4d938a29ec515ab6d815cfebe3c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the link farm point towards an attempt to redirect users to potentially harmful content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/pbw?utm_term=descriptive+essay+outline+template+pdf
    • https://samirimirusa.weebly.com/uploads/1/3/0/8/130814124/tuboxifivurumanowor.pdf
    • https://dalowosa.weebly.com/uploads/1/3/4/3/134383453/0e3967a6527ef8a.pdf
    • https://static.s123-cdn-static.com/uploads/4466175/normal_5ff281b68f0e0.pdf
    • https://static.s123-cdn-static.com/uploads/4380867/normal_5fe2beb6a7286.pdf
    • https://cdn-cms.f-static.net/uploads/4405437/normal_606e3231d20f0.pdf
    • https://lexabefi.weebly.com/uploads/1/3/1/3/131384613/pajapuj.pdf
    • https://cdn-cms.f-static.net/uploads/4495531/normal_6069a0848cb10.pdf
    • https://vovejurumek.weebly.com/uploads/1/3/4/6/134644047/pesebojunigeg_musik.pdf
    • https://mosuzikovadapa.weebly.com/uploads/1/3/4/6/134667275/vepenupeduvom.pdf
    • https://cdn-cms.f-static.net/uploads/4481166/normal_6021866ccb7e4.pdf
    • https://static.s123-cdn-static.com/uploads/4416332/normal_5fc6de61601b8.pdf
    • https://static.s123-cdn-static.com/uploads/4414864/normal_5fcc1c31f2340.pdf
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/3123811.pdf
    • https://cdn-cms.f-static.net/uploads/4388165/normal_60144c1de30bd.pdf
    • https://powipawi.weebly.com/uploads/1/3/4/3/134313445/cc0b95277b9ed4a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cbae8265-1254-43bf-8d14-fd3dc3a5a4f8/ti_nspire_cx_ii_cas_emulator.pdf
    • http://xalanupuzewo.pbworks.com/f/89609006055.pdf
    • https://uploads.strikinglycdn.com/files/5d45c952-ed48-460c-9ec7-2724923365f2/my_boyfriend_touches_my_belly.pdf
    • http://sawebaz.pbworks.com/w/file/fetch/144925080/list_of_keystone_species.pdf
    • http://kigiputilik.pbworks.com/w/file/fetch/144936804/25864728819.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_off0000db6c.bin
5abf4402e73186f7e22968bbb0555b321126358ed870dec9c8647f2aab08899f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 5460 bytes
font_01_sfnt_off0000edfe.bin
4ccfc31580a78ee9a60691f2b73e652337553adfd7a26d4ae839851dc12db715		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 9988 bytes

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