Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c38fb88ec9cfe1b…

MALICIOUS

PDF

82.5 KB Created: 2021-03-18 15:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f01cd2855505f530d4051473007a32c1 SHA-1: 26d6ea3a5d83c23712600fe12c9cbd1b4ea8c071 SHA-256: 9c38fb88ec9cfe1b3bc95dbbcebdb1578ff5b17da2a9ca040284e737d061f981
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to wood burning stoves, likely to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, pointing towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/strik?utm_term=how+to+get+the+most+heat+out+of+a+wood+burning+stove In PDF document text
    • https://static.s123-cdn-static.com/uploads/4480891/normal_5fec779ec694c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_601f192c50def.pdfIn PDF document text
    • http://pometukiwalevu.22web.org/kowadimipomuzuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_6021ce0de20f5.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesumor/Jhj05FD/jugifugejakisukexotalobod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_604f341163fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_602b754d09997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_5fdb88ee6f860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_5fe7804fe0698.pdfIn PDF document text
    • https://cdn.sqhk.co/fimirexuf/ihhaqif/origami_heart_valentine_card.pdfIn PDF document text
    • https://cdn.sqhk.co/xudogafu/diiYijq/kaiser_permanente_login_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/renosopezare/XFgimhf/35552590945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448986/normal_6001c25c11f2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vofiwevo.epizy.com/chapter_4_detrital_wash_answers.pdfIn PDF document text
    • http://dukoloxanad.epizy.com/tujenedoruvilisuxej.pdfIn PDF document text
    • http://maviwapas.epizy.com/tosuto.pdfIn PDF document text
    • http://rodowifesod.rf.gd/ipod_classic_30gb_hard_drive_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/kekikejejetaxuwigirizeti.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/33525703478.pdfIn PDF document text
    • http://rapuxatidugek.epizy.com/street_chaser_game_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/47595349610.pdfIn PDF document text
    • http://volajigatume.epizy.com/bokomuwuxujuf.pdfIn PDF document text
    • http://suxijiwuxupan.epizy.com/48783861322.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_off00010579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10579 5540 bytes
SHA-256: ab265faf0b27ebb508d68c49b5a077c40f783dd2621107f24a9708b62147f91c
font_01_sfnt_off00011842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11842 10536 bytes
SHA-256: 1434fbb0bfad4228fde55021a521962e6f095c2a0e4fe5cedcff47990ad271bb

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