Malicious PDF — malware analysis report

Static analysis result for SHA-256 9847e52589ff2553…

MALICIOUS

PDF

83.2 KB Created: 2021-01-22 23:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 42acd7d92f61a361e0c29c35a59789bc SHA-1: e0c2af6386cfe120a3328c4ed8e0e24c58af7a8f SHA-256: 9847e52589ff255318332606bf694878d950ec08f5283353b396df7e95212cf3
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 Weebly and other free hosting services, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to manipulate search engine results or redirect users to malicious sites.

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://trafficel.ru/123?utm_term=unwind+book+2+pdf PDF link annotation
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/paledimu.pdfIn PDF document text
    • https://site-1175393.mozfiles.com/files/1175393/95378075453.pdfIn PDF document text
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/dawozireku.pdfIn PDF document text
    • https://birugenok.weebly.com/uploads/1/3/4/6/134632973/loguxovanapar.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/dezukas.pdfIn PDF document text
    • https://site-1179390.mozfiles.com/files/1179390/61914818533.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/mejados/funesaxolijarofapaw.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/the_alchemistic_suitcase.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/voltas_cassette_ac_error_code.pdfIn PDF document text
    • http://nomekerileme.epizy.com/wowhead_warrior_leveling_guide_classic.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/uc_browser_old_version_2016_apkpure.pdfIn PDF document text
    • http://zerujafulo.rf.gd/berry_good_don_t_believe.pdfIn PDF document text
    • http://bajewilogofiro.epizy.com/97858217720.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/zexawurukiduma.pdfIn PDF document text
    • http://vigiwadovu.epizy.com/castor_informatique_rsultats.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/uci_chess_engine.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_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 4936 bytes
SHA-256: e6644af5faeb3961b27a993292bf17a56a96dff51e5147c8fbdcdb1427ba566f
font_01_sfnt_off00011a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A76 11016 bytes
SHA-256: 0ef7a320468d1d2a7f93e008ef947e92e25c420b787fdba1ed2901d48e04d594

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