Malicious PDF — malware analysis report

Static analysis result for SHA-256 a206198a74fdcb78…

MALICIOUS

PDF

76.7 KB Created: 2021-03-20 03:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88cec3d90d57514f9a39d4f8cd19f4e7 SHA-1: 1edcc184643391ae3cbe3bcd746a98d525be8c2b SHA-256: a206198a74fdcb78ace90d226311935f369c12bb13ed7972b159253c1e617689
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, indicating it functions as a link farm. One of the primary external URIs points to 'nipisod.ru', suggesting a phishing or malicious content distribution attempt.

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://nipisod.ru/award?keyword=cvc+words+flash+cards+pdf
    • https://sigipobixa.weebly.com/uploads/1/3/1/6/131606309/xisifurelix.pdf
    • https://semanipiji.weebly.com/uploads/1/3/5/3/135312460/091db98487830b0.pdf
    • https://cdn-cms.f-static.net/uploads/4413000/normal_603c79a57e354.pdf
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/e5ffc2f40d577a.pdf
    • https://tetiwaxope.weebly.com/uploads/1/3/0/7/130776033/c111a97ecc7f.pdf
    • https://fuxovibafisiboj.weebly.com/uploads/1/3/0/8/130874455/7738825.pdf
    • https://wenewemegidipep.weebly.com/uploads/1/3/4/6/134679414/keseda-doxaneti-kosenivinituwaz.pdf
    • http://rajukilodagoje.mygamesonline.org/lifetime_44_impact_adjustable_portable_basketball_hoop_instructions.pdf
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6030caddb913f.pdf
    • https://cdn-cms.f-static.net/uploads/4425238/normal_60261d12d2460.pdf
    • https://cdn-cms.f-static.net/uploads/4366018/normal_6031ee7f283ec.pdf
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/naveme-ranebita.pdf
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/9143886.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3a91a3f2-bfbb-4a4b-bd75-f43610fe27aa/4028777429.pdf
    • https://uploads.strikinglycdn.com/files/9d30e0bd-3c62-4444-957a-6359920c8b0c/the_house_on_mango_street_setting_quotes.pdf
    • https://uploads.strikinglycdn.com/files/cc8c2bc9-1419-4e0f-bd97-433d2987ebb6/93884592402.pdf
    • http://fajenadiwizowo.atwebpages.com/lch_m_dng_2020.pdf
    • https://uploads.strikinglycdn.com/files/725ca251-09c1-4732-a74b-208c457ea4da/best_undergraduate_english_programs_near_me.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_off0000ee4b.bin
e53972553ad35d8873a45199c723c81dffe0c6f9eba5438788503866156be390		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 5300 bytes
font_01_sfnt_off0001005e.bin
49c2b8ee74116386f0b8261c39789cd99afccb8964da1dc0c45c5aeced9d6338		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 11200 bytes

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