Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3c4314be9c1cf3…

MALICIOUS

PDF

83.2 KB Created: 2021-03-29 18:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98bd6f4cec6f937bc8adb933ab31ec53 SHA-1: d6fae636512a15dd509feb8be9e6a11611f29e12 SHA-256: 7e3c4314be9c1cf30edd6761c3e542793e504d63dae15465b8a0369c49ab5972
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. This suggests a malicious intent to redirect users to potentially harmful websites, possibly for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious activity. The ClamAV detection and ML classifier further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/aws?utm_term=audio+technica+lp60+usb+vs+bluetooth
    • https://doxizuzipoleri.weebly.com/uploads/1/3/5/3/135323895/5af083fc14ff8.pdf
    • https://tabawowap.weebly.com/uploads/1/3/4/5/134599755/51ce6a7232a0c1.pdf
    • http://wetiludivarag.scienceontheweb.net/fivuwupuralujedadefoxaviw.pdf
    • https://zadilomevesijob.weebly.com/uploads/1/3/4/5/134581884/167678.pdf
    • https://definifizuzum.weebly.com/uploads/1/3/4/7/134759181/3095520.pdf
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/zetusuwe.pdf
    • https://zowamuzifam.weebly.com/uploads/1/3/1/1/131163536/4133064.pdf
    • https://doxizuzipoleri.weebly.com/uploads/1/3/5/3/135323895/8358463.pdf
    • http://fonudesuwobulud.mygamesonline.org/88460983473.pdf
    • http://votapusi.mypressonline.com/bergamota_doterra.pdf
    • http://fiziwovana.22web.org/child_of_light_trophy_guide_and_roadmap.pdf
    • http://kidepokapila.22web.org/broadsheet_coffee_roasters_cambridge_ma.pdf
    • http://tokepubex.getenjoyment.net/altistart_48_fault_codes_clf.pdf
    • http://milatepe.medianewsonline.com/momof.pdf
    • https://nuxinipimop.weebly.com/uploads/1/3/2/6/132682773/veniti.pdf
    • http://wonozudobitisog.scienceontheweb.net/torot.pdf
    • https://kavavori.weebly.com/uploads/1/3/4/0/134012315/5464935.pdf
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/molures_regiwonat_menerazanuj_xoxajotideje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pufagaduvamoj.rf.gd/the_power_of_habit_review_indonesia.pdf
    • http://foliminuga.epizy.com/umbrella_academy_comic_book_vs_tv_show.pdf
    • http://zitilidi.rf.gd/is_abiquiu_lake_open_covid.pdf
    • http://fokibuzevurir.rf.gd/biological_science_textbook.pdf
    • http://bajewilogofiro.epizy.com/15506806224.pdf
    • http://kutoxinupuroxo.onlinewebshop.net/7th_grade_genetics_worksheet.pdf
    • http://wibukosumasej.rf.gd/2338029161.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010784.bin
1fe825d3a292e57fee73d592a068614fdd80fffb95642c3bd97baa0db16ef424		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 5548 bytes
font_01_sfnt_off00011a5b.bin
a296f48f38795fa3b8bb9711db8791c931125368ee5ebd9a63f754762402b412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5B 10880 bytes

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