Malicious PDF — malware analysis report

Static analysis result for SHA-256 164be5e88b655337…

MALICIOUS

PDF

77.4 KB Created: 2021-06-09 04:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e9ff30cb94d4213b3611f4d4ff781a02 SHA-1: 0fa2d0cd28a01f10bcf783772526010ce302b24a SHA-256: 164be5e88b6553375564175d511880110816f43e022b6bb28e8d147a93bda867
186 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. Several heuristics indicate this is a malicious SEO tactic, and ClamAV detected it as a phishing trojan. The embedded URLs suggest a distribution mechanism for potentially malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cructi.ru/pbw?utm_term=faded+lost+stories+remix+mp3+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425227/normal_6003ce9eb4b85.pdfIn PDF document text
    • https://xibowawagapuj.weebly.com/uploads/1/3/1/3/131383975/doxadapep-xixagok-mojiwusute.pdfIn PDF document text
    • https://vowotefanofug.weebly.com/uploads/1/3/4/0/134012563/rexuziwudas.pdfIn PDF document text
    • https://vokafevevuw.weebly.com/uploads/1/3/4/3/134320681/20c3b.pdfIn PDF document text
    • https://xuniwinasifobip.weebly.com/uploads/1/3/5/3/135302293/431fc571e46b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5ff58b2f165c7.pdfIn PDF document text
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/vimuzotamifaw.pdfIn PDF document text
    • https://binolopokam.weebly.com/uploads/1/3/1/4/131484395/143bcccfc936089.pdfIn PDF document text
    • https://bisaderivulele.weebly.com/uploads/1/3/4/7/134744485/batesavigejixudev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_5fe7fcd2b4103.pdfIn PDF document text
    • https://busejupeguwija.weebly.com/uploads/1/3/0/7/130740624/781969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_6043c1aff3c78.pdfIn PDF document text
    • https://migaxodilex.weebly.com/uploads/1/3/4/8/134852634/f2ccd9d2fb3a.pdfIn PDF document text
    • https://guxafewesev.weebly.com/uploads/1/3/4/5/134595620/4714501.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/2b0cbbea-d22d-46a1-8590-2c3dc5a83e02/network_marketing_course_in_delhi_university.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144421644/un_lugar_en_silencio_2_fecha_de_estreno_peru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7cc543a-3fbd-4654-97e8-b873b2f98410/how_to_use_a_kangertech_evod_vape.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/w/file/fetch/144830337/daily_bible_reading_calendar_2020.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144749715/what_are_the_10_major_sins_in_islam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfaa6ad-a797-4c57-851e-a83ff84cfe5b/xifomima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe6e1cc-8fbf-46d4-b23f-9b70bee6f15f/12705239518.pdfIn PDF document text
    • http://goferupemo.pbworks.com/f/77731207305.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144911949/73808149552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cff0956-1b7a-4eb9-b17f-09fe269ded18/holmes_tower_fan_htf3222a_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 5384 bytes
SHA-256: a31e25c3863df79248016c9b9eb1affcfb9e102292458445eada0fa493cca9b2
font_01_sfnt_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 2468 bytes
SHA-256: 06db5a57ea8788f969a2a90d7c2e37bb6758191cc37cb57cfce7f63857b235a7
font_02_sfnt_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 17848 bytes
SHA-256: 2d89792cc7d28ac18c8bc876de759d264b9b1a1a201c8aba3e4b198790c15f23