Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94356d8b20d514b…

MALICIOUS

PDF

81.3 KB Created: 2021-04-23 05:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9fa64da888540cb6d54df9438eceed71 SHA-1: acb6d7cabf744a1547319009c5d955afc2784f2a SHA-256: d94356d8b20d514b4c9806d265298762bda3c7c98951475ba8a919594bd5ee14
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV specifically flagging it as a phishing trojan. The embedded URLs suggest a phishing or SEO manipulation scheme, likely intended to lead users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=irregular+verbs+past+participle+test+pdf PDF link annotation
    • http://dofapupore.22web.org/the_fifth_wave_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/idKhjge/guess_the_disney_character_quiz_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuzofu/bo42M2o/kovakixagamaw.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/B1I5Rii/shark_ion_r75_vs_r85.pdfIn PDF document text
    • https://jewakazakiven.weebly.com/uploads/1/3/1/4/131437085/3972571.pdfIn PDF document text
    • https://cdn.sqhk.co/zumumolebajo/icighfF/when_will_cruise_ships_sail_again_from_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/guregame/pAHggih/free_slots_to_play_for_fun.pdfIn PDF document text
    • https://mepovokure.weebly.com/uploads/1/3/0/9/130969824/eba4b9333f606c.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/0gijdie/criminal_case_mysteries_of_the_past_case_42.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/hMheHxK/gerezupizelitovanabotup.pdfIn PDF document text
    • https://cdn.sqhk.co/gukitane/HRuaPif/fall_guys_funny_walkthrough_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/fukaxaxod/zhcgjVM/92706219752.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/hxhbhh3/79210308985.pdfIn PDF document text
    • http://kapubasezo.iblogger.org/saeco_caffitaly_map_coffee_machine_manual.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/ab7a9222b.pdfIn PDF document text
    • https://xetusuzumarax.weebly.com/uploads/1/3/4/0/134013097/pepevutagiv.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/iFigjfF/jesojexononumedijaza.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/jcO9bbD/33589313991.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/bjchga1/xutisazefifakepesogu.pdfIn PDF document text
    • https://jazitilifa.weebly.com/uploads/1/3/1/4/131414561/a955fa.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/bgdhcnt/arknights_recruitment_tag_top_operator.pdfIn PDF document text
    • https://raduwefun.weebly.com/uploads/1/3/1/1/131164260/ea81e93a.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/QGhiIgf/soccer_star_2020_voucher_codes.pdfIn PDF document text
    • https://xuposebifaperep.weebly.com/uploads/1/3/4/6/134673232/powinodawu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dunixojojulif.epizy.com/wasivumekivuvosakoxemev.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 5460 bytes
SHA-256: b865e066f9b3faabced17f5f1a42d633b06bcb182bb67df13a6494d124ed3484
font_01_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 10572 bytes
SHA-256: a6b0ca608fbe82ed0c9b8fa5a238ec4129493428549c979cde36e32e4fba827a
font_02_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501