Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc5645f85e73a7c…

MALICIOUS

PDF

77.3 KB Created: 2021-02-19 00:36:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1ca3fea4851488a3d9a9f09afa7acf5f SHA-1: 84a6fa44b22f174b5659308b3c8588b5acc6e257 SHA-256: 2bc5645f85e73a7c3bed1dc83416d013f9b69c32c60208b2cb02a8beaffec724
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to PDFs hosted on suspicious domains, suggesting a link farm or redirection mechanism. One of the primary URLs extracted is 'https://baarspo.ru/strik?utm_term=what+is+bulk+mailing+rate', which appears to be a lure related to search engine optimization. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=what+is+bulk+mailing+rate PDF link annotation
    • https://cdn.sqhk.co/dogilijesiwu/gDjgBsG/super_funny_ringtones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuduwedimu/iibqjac/dixie_d_amelio_song_lyrics_deutsch.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/icojeHc/30072795784.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/i2zdvZo/mugiriwenobaragu.pdfIn PDF document text
    • https://cdn.sqhk.co/dipewoduge/cL9OKMy/20919240948.pdfIn PDF document text
    • https://cdn.sqhk.co/tojebaru/c4iemab/patijisubatadugu.pdfIn PDF document text
    • https://cdn.sqhk.co/fatepotax/ijsigJG/age_of_empires_wololo_song.pdfIn PDF document text
    • https://webuwoterin.weebly.com/uploads/1/3/4/5/134589655/ridaxomimeg_nonomewekito.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/e9s1Mhf/35538748118.pdfIn PDF document text
    • https://cdn.sqhk.co/gatavazer/ihhi8jc/norigakexotixisekom.pdfIn PDF document text
    • https://cdn.sqhk.co/liregevo/eigifje/xezufumibutipalekefone.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/bk9BUdU/26363172982.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/verirejon/free_ableton_live_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/83233261063.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/29323734765.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/chrome_app_for_pc.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_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 5316 bytes
SHA-256: c96adaadc0648a9e649a0537771b8043041ba0a0d98ce6afb7e3a426d448b4ef
font_01_sfnt_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 10816 bytes
SHA-256: deee5b9a04924c6ac581c0c061d0f703991d30bd7391bc5913f6b12da6d0b39c

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