Malicious PDF — malware analysis report

Static analysis result for SHA-256 156ecf6dbdf88397…

MALICIOUS

PDF

67.4 KB Created: 2020-11-21 22:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40a56d977f433facb2471c03532ddbff SHA-1: d0b271b060541d479726166a9056f45fe5250e1e SHA-256: 156ecf6dbdf88397c79e2ef230f6e01053661bc95a6c46ac7cf6f86ccd5782f7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://traffking.ru/123?utm_term=lewis+and+clark+and+me+worksheet+answers', is directly associated with the malicious verdict and ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to 'Lewis and Clark and me worksheet answers', indicating a phishing or social engineering pretext. The presence of embedded JavaScript, though not explicitly detailed in the provided heuristics, is a common vector for malicious PDFs.

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://traffking.ru/123?utm_term=lewis+and+clark+and+me+worksheet+answers
    • https://walinakonefal.weebly.com/uploads/1/3/4/3/134316097/fusixejevufozodapime.pdf
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/1bee5c3.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rezareludufiven-voxodopi.pdf
    • https://dufejubodumafeb.weebly.com/uploads/1/3/4/4/134444341/a6d6e170c7a19.pdf
    • https://xasufedi.weebly.com/uploads/1/3/4/6/134683860/ecbf8f3e33bc4d.pdf
    • https://kowonuzadanovit.weebly.com/uploads/1/3/4/6/134686130/lomerudu-luletikomoduxo-xokisixanetiju.pdf
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/wujujub-jilixefunom-fodoxamimafaxo.pdf
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/8742796.pdf
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/kixakokoxunuri.pdf
    • https://zetizisoxaw.weebly.com/uploads/1/3/4/4/134498522/060cffb2a.pdf
    • https://zadisoro.weebly.com/uploads/1/3/4/5/134525292/d028fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/97c7f1cd-f356-4dbd-a3cf-31d4b0b6f160/97831109181.pdf
    • https://s3.amazonaws.com/numegubowalonan/nation_high_school.pdf
    • https://s3.amazonaws.com/baxegezivumi/advanced_business_vocabulary_in_use.pdf
    • https://s3.amazonaws.com/zafirawit/movie_box_plus_2019_apk_download.pdf
    • https://s3.amazonaws.com/fejenijovekozu/navy_start_guide_2019.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_off0000cd6f.bin
836d1a645663a6b4e0ccc07bf6ad63ea7af9f6e1ffe3898c0e182e3f601df5bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6F 5276 bytes
font_01_sfnt_off0000df4a.bin
2fde23156f73f061fb02ac69cba81911fbbdcba273aed436e11d24b15579e0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 9820 bytes

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