Malicious PDF — malware analysis report

Static analysis result for SHA-256 1482b0183e692d07…

MALICIOUS

PDF

77.6 KB Created: 2020-11-19 21:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2a30427b70efc72b11b5f0167db6ae1 SHA-1: 91777c6d659c8a6d5fb60d984d43eca1721e6465 SHA-256: 1482b0183e692d07c0e4de37f911124879455d053dc94826636a3404ce9f6bc2
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one of the primary URLs being `https://trafficel.ru/123?utm_term=clep+chemistry+exam+secrets+study+guide`. This heuristic, combined with ClamAV detection and ML classification, strongly indicates malicious intent. The document likely serves as a lure to direct users to potentially malicious content or phishing sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=clep+chemistry+exam+secrets+study+guide
    • https://wanezetisozol.weebly.com/uploads/1/3/4/4/134468493/nafaresizi.pdf
    • https://neburaguvud.weebly.com/uploads/1/3/4/4/134477844/kilegowukesoweb.pdf
    • https://cdn-cms.f-static.net/uploads/4502563/normal_5faf7d3ccb1bf.pdf
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/6923634.pdf
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/66dad5b4552c574.pdf
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/sadinojesok-gosoto.pdf
    • https://cdn-cms.f-static.net/uploads/4387573/normal_5f95b449de6ae.pdf
    • https://figeneluniw.weebly.com/uploads/1/3/4/8/134857588/totivo.pdf
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/xekumeguz.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/2122744.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d370d7cc-a955-40b4-8496-f549a4950784/85831236464.pdf
    • https://s3.amazonaws.com/lebaxa/scrivener_pour_android.pdf
    • https://uploads.strikinglycdn.com/files/ec4ad708-dc6a-4dfa-ab28-b50a07721bd4/26848364902.pdf
    • https://uploads.strikinglycdn.com/files/ad45c12a-f2b8-4c46-b81e-0a5960dfbe0f/bipuwaxutu.pdf
    • https://s3.amazonaws.com/wikurixobelu/kanuzovuguxoresosu.pdf
    • https://uploads.strikinglycdn.com/files/68ada0d4-2d44-4182-8a51-96c119339a59/sijenigafadoziduj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc08.bin
2d1ef5c18649634b8b320023f901f6412f9da0ea0f4cbbce9901fa946bcea5da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 5736 bytes
font_01_sfnt_off0000efe4.bin
fa0a7acec216ac585b1d598484a4f7b336c2728c9495c832d162ba3fe83d634b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 5560 bytes
font_02_sfnt_off000102ac.bin
cf7537872cf4427655fe9fdf31fcf1e51c592ab91ea7fb542f4b618d054ad9e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 11324 bytes

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