Malicious PDF — malware analysis report

Static analysis result for SHA-256 abdda7d9e84ad1b3…

MALICIOUS

PDF

78.3 KB Created: 2021-06-01 02:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3c22ee691dd6e43bed2c3e8d410a82d SHA-1: b4d73e1077951fcaa6d3fc893b43df19e4910343 SHA-256: abdda7d9e84ad1b36eb4c22aaeacf5a4b6d1eaa04f9c7092cbaafd70706656da
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary links, https://philabc.ru/pbw?utm_term=auto+mechanics+job+description+for+resume, suggests a potential phishing or SEO spamming campaign. The ClamAV detection and ML classifier also strongly indicate malicious intent, likely related to phishing or distributing further malware.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/pbw?utm_term=auto+mechanics+job+description+for+resume
    • https://static.s123-cdn-static-d.com/uploads/4392237/normal_60aff77810e11.pdf
    • https://static.s123-cdn-static.com/uploads/4368999/normal_6008760671fe9.pdf
    • https://sapuvitajesi.weebly.com/uploads/1/3/0/7/130776539/1643496.pdf
    • https://cdn-cms.f-static.net/uploads/4375352/normal_6012f96000565.pdf
    • https://nozirokopen.weebly.com/uploads/1/3/4/6/134613575/xafadeka.pdf
    • https://static.s123-cdn-static.com/uploads/4463807/normal_5ff4216a8506f.pdf
    • https://static.s123-cdn-static.com/uploads/4406202/normal_5fed9d98b97aa.pdf
    • https://burevojaziji.weebly.com/uploads/1/3/4/7/134729690/tanubixeloluguze.pdf
    • https://vilemanunopabom.weebly.com/uploads/1/3/4/3/134317174/tusuxijupu_bitonitule.pdf
    • https://vobolatit.weebly.com/uploads/1/3/4/3/134349562/mileve.pdf
    • https://cdn-cms.f-static.net/uploads/4421966/normal_60316908e1e73.pdf
    • https://static.s123-cdn-static.com/uploads/4388406/normal_5fe5b7b826673.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lijegazoz.pbworks.com/w/file/fetch/144415695/how_to_gain_weight_in_a_week.pdf
    • https://uploads.strikinglycdn.com/files/ef45769b-d425-4886-a9dd-f8519bf02bdc/37344875532.pdf
    • https://uploads.strikinglycdn.com/files/a29c75a2-8e16-4a37-aa20-5c11775dfd76/can_you_download_minecraft_free_on_pc.pdf
    • https://uploads.strikinglycdn.com/files/f2b90bf6-1c1d-4877-b440-7d02f81c0789/casio_wr100m_stopwatch.pdf
    • https://uploads.strikinglycdn.com/files/0f04f117-2d26-4e5e-8b47-33895e2099a1/mapa_conceptual_de_los_tipos_de_transporte_de_la_membrana_celular.pdf
    • http://negovijalulu.pbworks.com/f/super_robot_wars_r_gba_english_patch.pdf
    • https://uploads.strikinglycdn.com/files/fbf4f7ae-b019-485b-9fe8-943c5fc38ed7/xofusu.pdf
    • https://uploads.strikinglycdn.com/files/6275aaeb-a31d-4239-bbdc-46fedcf83901/sayings_of_the_desert_fathers_amazon.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_off0000f1c4.bin
1fcfb5fb440b2f3269bbea26adc543bbc6f4e41afd6ae3a23012c428b280fe51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 5568 bytes
font_01_sfnt_off00010487.bin
aaa9f43755df2258b5a5fd7800700103e6763445dc78b8a62e56d01efcf0cfc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 11544 bytes

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