Malicious PDF — malware analysis report

Static analysis result for SHA-256 715cc3835defd5cc…

MALICIOUS

PDF

70.8 KB Created: 2021-03-13 12:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63a9306547a309ec86925800dbe56048 SHA-1: 86f6752d5dcba3caa7613d22b194e1a747eced2f SHA-256: 715cc3835defd5cc7983450433aa094cca6f6643f515fad2d0a3cce34fec915c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm or SEO abuse. The primary URL, 'https://crophysi.ru/wix?keyword=average+velocity+worksheet+pdf', suggests a lure to disguise malicious intent. ClamAV and ML heuristics confirm the malicious nature, classifying it as a phishing trojan. No scripts were extracted, but the extensive link farm points towards a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/wix?keyword=average+velocity+worksheet+pdf
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/kiligudamigifona.pdf
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/24a1d.pdf
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/vejeba.pdf
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/7e61c8e.pdf
    • https://pugufatafa.weebly.com/uploads/1/3/5/9/135967981/wolibiritafi_kodozima.pdf
    • https://warapado.weebly.com/uploads/1/3/1/4/131437563/9155554.pdf
    • https://cdn.sqhk.co/xumelesep/4VgdWPL/10247297360.pdf
    • http://usesalle.xyz/boxaratogisibopitqwej.pdf
    • https://cdn.sqhk.co/zatanolivog/7yMgjhh/42583324691.pdf
    • https://cdn.sqhk.co/mafulavet/iPvIgdd/xbox_360_wireless_earphones.pdf
    • https://cdn.sqhk.co/tukawezezo/jjFh8hb/fozebomugagul.pdf
    • https://cdn.sqhk.co/lididiregi/0hhiggj/kebol.pdf
    • https://cdn.sqhk.co/nimotixalulo/ijhiaTk/vegonixopasofilapujud.pdf
    • https://cdn.sqhk.co/narulaloro/GkijjeW/crossing_swords_tattoo_meaning.pdf
    • https://cdn.sqhk.co/towinomer/iiUiegc/devepetunalebokak.pdf
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/jowuruf-fixemil-pinekumu-damerunatutas.pdf
    • http://goossyy.online/497238414355xnl5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mavixu/how_to_reboot_spectrum_cable_box_after_power_outage.pdf
    • https://s3.amazonaws.com/jijari/turner_classic_movies_app_android.pdf
    • https://s3.amazonaws.com/jixeremipet/lutugilosukidonukuvaruso.pdf
    • https://s3.amazonaws.com/nezanurugega/debex.pdf
    • https://s3.amazonaws.com/musoxifuvitalo/tetunup.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_off0000d649.bin
ec9ee640e8a9d7a3e52b17e9f78d832dd2dde2c3bc64715abb7b4c667129046c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 5724 bytes
font_01_sfnt_off0000e9e1.bin
0dae03819d4fc132bb9c0cc35151471fc05864335998815d0c45bc687c93305d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 10592 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.