Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e76b12b8a51e74…

MALICIOUS

PDF

72.6 KB Created: 2020-11-25 12:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b8ced69dcf8acfe261bc7b2f4869884 SHA-1: 282108b11a56ee9b829a42088ef3fc86d48e4712 SHA-256: b7e76b12b8a51e746f3e661802207285f58c4e4d169bc0f36f2bc6bd4ac8ee1f
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 pointing to S3 buckets and Weebly-hosted PDFs, indicative of a link farm or SEO manipulation. One of the primary external links, 'https://trafficel.ru/strik?utm_term=convert+30oz+to+cups', suggests a lure to disguise the malicious intent. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=convert+30oz+to+cups
    • https://mazofowi.weebly.com/uploads/1/3/4/3/134312703/pagomimetapujol.pdf
    • https://kovipokuvukos.weebly.com/uploads/1/3/4/4/134497495/widorejulupujis.pdf
    • https://jivixetikuzi.weebly.com/uploads/1/3/4/7/134745571/c63714190689.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wovisak/jhankaar_beats_full_movie.pdf
    • https://s3.amazonaws.com/ditiruz/carter_grayson_and_dana_mitchell.pdf
    • https://s3.amazonaws.com/fedojigudaj/grand_chase_apk.pdf
    • https://s3.amazonaws.com/pusixa/2017_challenger_gt_performance_upgrades.pdf
    • https://s3.amazonaws.com/rawesaragegugar/64018361645.pdf
    • https://s3.amazonaws.com/tamobalasu/roh_wrestling_roster_2020.pdf
    • https://s3.amazonaws.com/nezanurugega/rotasaxubemaj.pdf
    • https://s3.amazonaws.com/zurovajij/54454301854.pdf
    • https://s3.amazonaws.com/tinivukedeta/segere.pdf
    • https://s3.amazonaws.com/fejakixoweka/sawurewoloruvuligepelulu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca28.bin
acd2d9e6144ca585bd7b87c6f1c2c60dc9d2500664162f34adcd0a40bea196ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA28 5004 bytes
font_01_sfnt_off0000db51.bin
bbd4453fe04fa254cafa4027d557a8362d92291f510dbd38ebe5f88a46c40478
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 10668 bytes
font_02_sfnt_off0000fff4.bin
5cb4188777f33cd410073f8b9d14bcb5a62f3956273c75e1cc66e568e6902af1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 16216 bytes