Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2d631c802675b4…

MALICIOUS

PDF

65.3 KB Created: 2020-11-25 03:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8c96eb5c6a088546a4839af31f51da25 SHA-1: 9ff51aab83a9fd79f6aaedb99da329da08a01165 SHA-256: 8b2d631c802675b47d05a670422344f8e484b9f1125b88c6e239813239018f0b
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to Amazon S3 buckets, but one prominent link leads to a redirector URL (https://trafffi.ru/strik?utm_term=ge+led+christmas+lights+c5) disguised with search terms. This suggests a phishing or SEO poisoning attack designed to drive traffic to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffi.ru/strik?utm_term=ge+led+christmas+lights+c5 PDF link annotation
    • https://molireju.weebly.com/uploads/1/3/4/6/134630509/80bb7f8b6c5da.pdfIn PDF document text
    • https://jenititufevi.weebly.com/uploads/1/3/4/5/134595561/bunajibadoj_kixikisexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f8e8c4b0792b.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/tutapaxi/35361577923.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/synonyms_antonyms_homonyms_and_homophones.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/lixijetajunap.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/adriana_ross_a_former_model_from_poland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba6d238-88af-4a28-9e9d-9bd009e310ff/tiffany_thompson_bruises.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/desktop_backgrounds_artists.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/the_walking_dead_our_world_cheats.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/23854734307.pdfIn 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_off0000c2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D8 5508 bytes
SHA-256: 76b41acc8ee6c3cbfdb9b3f420fd3cd25dda04f53a1ed1c51b1fd7dd0401347d
font_01_sfnt_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 10376 bytes
SHA-256: 61284c70c15840cc5136f7519cdc67ec8d806295198b5c2fc33063d02120b180