Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff8cef223d1d187…

MALICIOUS

PDF

77.9 KB Created: 2021-03-30 09:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5ac910b6b3ac17a5b52c61c98908ad2b SHA-1: 737c87e361c73717cecb050f5bbdff30147500bc SHA-256: 8ff8cef223d1d1879bbbcb97c2329978fc868f81c91739d43a4720089a0a843c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://jumiwimov.ru/award?keyword=australopithecus+garhi+pdf PDF link annotation
    • http://redirerer.medianewsonline.com/moon_river_lyrics_audrey_hepburn_chords.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/12035612127.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/iihfgi1/55792375420.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/15821288289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502246/normal_6025318abedcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375344/normal_5fcf3d198c6ca.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/JMiiWig/bauer_ice_hockey_skates_vapor_x2._5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491705/normal_602206d547f0b.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/Lgghbtb/zabikudusasamijaduv.pdfIn PDF document text
    • https://cdn.sqhk.co/sexipemajim/hhVjdge/benefits_of_globalisation_in_developing_countries.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448986/normal_602c1151c045e.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/iRliicS/nipapebigosu.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/goroditojililu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeec54c1-6dc1-40e1-9119-472a3b63bff1/55802977477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2938e1a-51a5-4651-a06b-335f708308ae/what_is_the_meaning_of_terminated_in_bengali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd93413d-3fe6-427a-ba3f-cb41061fb731/38011139388.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/bedevawizabogafofosome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc6d49d-2bf9-435a-ae1a-f4ce2b81a9f8/4923611355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2dc8ecd-782f-4127-980f-dc5659fd94d4/vitamix_5200_price_in_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/jubijanuxizuzot.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/the_carmichael_show_season_1_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77743301-8d14-4e3c-b392-9fd563198143/36985516020.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/frozen_songs_free_in_english.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_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 5408 bytes
SHA-256: 4e53394b9915dbc57607a4fd1dae7f1abd4484d4322aca4065b2e46981782453
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 12380 bytes
SHA-256: cc6b6e6c313d193986d2b190f387d3d7636d0dd4b04392d353282e294506afc7