Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a80c1fa6fb7eb3…

MALICIOUS

PDF

84.0 KB Created: 2021-05-21 01:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 26c049bba09b3234d56999980226a881 SHA-1: 5ee26c836e1574de58063af954e6ad7d4b35e207 SHA-256: 18a80c1fa6fb7eb3b02487e5530d4c319adceebbc80bef95c4844895754bba31
216 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized PDF files, suggesting a link farm. Crucially, one heuristic identified a brand-impersonation credential phishing lure for eBay, pointing to a redirector URL. The ClamAV detection and ML classifier also strongly indicate maliciousness, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/0a735d6.pdf.
  • 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://bologen.ru/strik?utm_term=history+of+english+literature+mcqs+with+answers+pdf PDF link annotation
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/0a735d6.pdfIn PDF document text
    • https://kowizonijate.weebly.com/uploads/1/3/5/9/135991151/bemowirijelif.pdfIn PDF document text
    • https://jomufoxubibad.weebly.com/uploads/1/3/1/1/131164047/sigaruro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471946/normal_601f95456070d.pdfIn PDF document text
    • https://jejepijukutu.weebly.com/uploads/1/3/4/1/134131362/8bc346952226032.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482189/normal_5fdf80ac3edd7.pdfIn PDF document text
    • https://dutegonuguval.weebly.com/uploads/1/3/4/3/134310875/xejubotejojav.pdfIn PDF document text
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/2297035.pdfIn PDF document text
    • https://butiriretife.weebly.com/uploads/1/3/2/6/132681404/polemiwajavebuw-vapidujoz-ketonivopumivin-wufinef.pdfIn PDF document text
    • https://regegejote.weebly.com/uploads/1/3/4/4/134489776/mavawujagumupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5fd1458831692.pdfIn PDF document text
    • https://modofanapaf.weebly.com/uploads/1/3/4/6/134676621/2436c8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474192/normal_60597b79bf455.pdfIn PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/fewexitusowaxude.pdfIn PDF document text
    • https://demepeli.weebly.com/uploads/1/3/4/6/134632839/jojafibop.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/wazorixekunafob/best_cookie_sheet_organizer.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/88545664503.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/cant_connect_to_my_linksys_extender.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/mitupoxopito.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/2019_answer_key_scholarship.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/rufaxuredamelekenidirisuw.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/common_interview_questions_and_answers_for_internship.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/simajufafid.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 5852 bytes
SHA-256: d3072aaf1b23b0fca17fec87f305c3766346feaedf85f148342093d5fc3bf973
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 1936 bytes
SHA-256: 21a7146106e2ad29a4dcc6aa55cee169416400570e2b3d493b6d071cb256f2f3
font_02_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 10936 bytes
SHA-256: 214edf9b0f03cea7489d1e19ab9d8153da0ffa5c8c145f147a2f721c381c4ca8
font_03_sfnt_off00012ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC7 16544 bytes
SHA-256: c64f975c7c74378765a15e192890ba001b575443647995d4109c17b56814fb1e