Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afb39e374664469…

MALICIOUS

PDF

82.5 KB Created: 2021-03-15 12:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6037b4fee7b069fba08d475e669675d7 SHA-1: 52aa2852b049a5019069b3e7ab4eba5b495033c7 SHA-256: 3afb39e37466446994f48d1f67bdda8554e2fd6382cd6527326a357442b7407a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files with numeric or generic slugs, indicative of a link farm for SEO manipulation. One of the primary external URIs, 'https://druttle.ru/wix?keyword=mcat+study+books+pdf', suggests a lure related to study materials to direct users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://druttle.ru/wix?keyword=mcat+study+books+pdf PDF link annotation
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/7431090.pdfIn PDF document text
    • https://magalezofutik.weebly.com/uploads/1/3/4/5/134599277/ca45427d65c1b88.pdfIn PDF document text
    • https://jorogusanige.weebly.com/uploads/1/3/4/7/134715450/6214396.pdfIn PDF document text
    • http://verifybadgesbusiness.com/how_to_calculate_mean_from_probability_distribution_tables84tg.pdfIn PDF document text
    • http://kind-insta.site/android_games_convert_to_pc_freerqha3.pdfIn PDF document text
    • https://kasorewo.weebly.com/uploads/1/3/2/7/132740312/498617.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/2395592d34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widuxade/75756476728.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/movowenipowotenan.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_918421ccc54947e7a12f770a7e1a9994.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bivanud/89905431530.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/wezigolizelujuwum.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/amaravathi_movie_song_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/73528620270.pdfIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_000f3ec58a1c4a049169d56059df2ada.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tofizo/5934041758.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/82394297430.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/86630213250.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_73dddc95d4194a53bce03efdbf369b8d.pdf?index=trueIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_8c77673c129e4eef9146f3ec94db37dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/33348045410.pdfIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_cdfc2ef5969e4cbba34b7e321e320d8e.pdf?index=trueIn PDF document text
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_3a256b27c07a41618f421de80541ef01.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 5332 bytes
SHA-256: 969640a54d42ca38c1b41149ec5c92f609e14ebd027a11bfbfa3a419d5be81c7
font_01_sfnt_off00011505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11505 11492 bytes
SHA-256: c7172b223b55ea370cb2d0342c5bd0b6c4b2aeb8ac7069d169eb5033f682e879

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