Malicious PDF — malware analysis report

Static analysis result for SHA-256 641aeba35494a790…

MALICIOUS

PDF

126.8 KB Created: 2021-05-16 21:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7cc351a0e9ee3140ca000e54a15ff84d SHA-1: cc340da96ca61733f46b9310936bd22710c7013a SHA-256: 641aeba35494a790e30c02936ef4e6a7853d1dde18fc616cc3cc97260c162fa0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and using UTM parameters, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://resalured.ru/strik?utm_term=dish+network+login+problems PDF link annotation
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/2db3808a1df2.pdfIn PDF document text
    • http://azakalaza3.xyz/bajadipibifowopad2044v.pdfIn PDF document text
    • http://topstudy.fun/bushi_kabuto_homare0yq7s.pdfIn PDF document text
    • https://binimejo.weebly.com/uploads/1/3/4/6/134665204/898b33a8.pdfIn PDF document text
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/c83fa309a4.pdfIn PDF document text
    • https://wokabilizivamu.weebly.com/uploads/1/3/2/7/132712023/sujewifuk_kakagazida_muponokib.pdfIn PDF document text
    • https://zodazapel.weebly.com/uploads/1/3/4/5/134511258/juverasal-zobelewaf-dagevifobapi-muxokafinopokuw.pdfIn PDF document text
    • http://trenolgia.buzz/death_stranding_timefalllr2cw.pdfIn PDF document text
    • https://pitefomut.weebly.com/uploads/1/3/2/6/132682610/razes-naneravojur-dixefi.pdfIn PDF document text
    • https://runizupila.weebly.com/uploads/1/3/4/3/134320381/6759273.pdfIn PDF document text
    • https://jeduwisuduxib.weebly.com/uploads/1/3/1/4/131483356/8e77ef2e0894a.pdfIn PDF document text
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/4ab5c985c9.pdfIn PDF document text
    • https://nimopiwezu.weebly.com/uploads/1/3/4/7/134700470/tatop_dezapus_paxenuw_vezisugedi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/77b38b69-b3b8-4d5f-bdd4-150dbfb727f8/sketching_from_the_imagination_anime__manga.pdfIn PDF document text
    • http://wowijikozo.epizy.com/wekimamuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/47882289534.pdfIn PDF document text
    • http://labopum.rf.gd/area_of_a_circle_and_circumference_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd7130f-7d30-4ffb-97c2-b9ec503d9bb9/71277840732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159a8471-c2a1-4722-a58b-5f08cd499b0d/97038152787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6afa63-ae26-4d21-ad28-ba96cee9e95d/51314346248.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/what_is_the_theme_of_the_book_a_long_walk_to_water.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/bible_concordance_esv.pdfIn PDF document text
    • http://guwupurog.epizy.com/how_do_spaceships_overcome_gravity.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/nothing_else_matters_chords_guitar_intro.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/32075804048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99330c30-fdc2-4956-b3a1-4e134d6bd8e5/dudagowafozate.pdfIn PDF document text
    • http://rixefixefasi.rf.gd/71439884331.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_off0001a544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A544 5108 bytes
SHA-256: 5bba986a4cf47bbb238061941767df3f9c0e779fd6fbc3fde7fcf0011ee2f6f9
font_01_sfnt_off0001b67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B67D 11840 bytes
SHA-256: 30339c434d6d6ee862f16f3918d054c9efb9781e317f63faa18e2cc2be9744a2
font_02_sfnt_off0001dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEA1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34