Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff529eaf85853ae…

MALICIOUS

PDF

80.8 KB Created: 2021-05-01 08:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2b0efa1258ff47dfe133d3a941a5514b SHA-1: d4f4993189152286f7f24bdec4a227d982152b13 SHA-256: dff529eaf85853ae9718ce19a7f7056113dcfeb7d4396041ac24cc532cd0fdc5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious or scam websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://baarspo.ru/strik?utm_term=brother+hl-2040+drum PDF link annotation
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/sofisefigaduwaginiji.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/5293872.pdfIn PDF document text
    • https://vurinilobato.weebly.com/uploads/1/3/1/4/131454355/dolowi_tidokunabur_bisuxub.pdfIn PDF document text
    • http://jisutuxoxaza.medianewsonline.com/polimeros_biodegradveis.pdfIn PDF document text
    • https://detalejutapebis.weebly.com/uploads/1/3/4/6/134610814/dutox_vaxatiz_zavita_sodamatunen.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/lego_harry_potter_diagon_alley_2020_release_date.pdfIn PDF document text
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/3090500.pdfIn PDF document text
    • http://nositadox.mypressonline.com/powos.pdfIn PDF document text
    • https://jevogebog.weebly.com/uploads/1/3/2/3/132303093/70b0bf.pdfIn PDF document text
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/dadowezuj.pdfIn PDF document text
    • http://mejumafegebameg.mygamesonline.org/abordagem_psicanaltica.pdfIn PDF document text
    • https://tonuwuro.weebly.com/uploads/1/3/0/7/130739505/3351518.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/fuvim.pdfIn PDF document text
    • https://fonasidijefem.weebly.com/uploads/1/3/4/6/134636639/kudegidagike-pafezet-linulupabeju.pdfIn PDF document text
    • https://seronenufides.weebly.com/uploads/1/3/1/4/131407086/wovamosupu.pdfIn PDF document text
    • http://pasiworuwiwoz.getenjoyment.net/75590787908.pdfIn PDF document text
    • https://rodetexozu.weebly.com/uploads/1/3/6/0/136096338/jowujasovof.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/manfaat_binahong.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/chaos_theory_definition_oxford.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/d68cb0dd-7162-43bd-aff5-824a0f513f13/how_long_does_it_take_to_charge_tough_solar_g_shock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c21104-be5d-4ab0-81c4-2788e88ab8e4/fomijojuvunoger.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/central_park_guillaume_musso_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/929b0754-9d34-44c3-8413-abead0144ef4/83907995731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9196f0f9-c491-4847-a4a1-43c08a537e0d/devils_bible_documentary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5422056-50da-4c84-bae8-d451f538383b/how_has_covid_19_affected_employment_in_ireland.pdfIn PDF document text
    • http://doritiwenoxa.onlinewebshop.net/camra_good_beer_guide_2020.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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 4848 bytes
SHA-256: 9a00673258c1d32c80b05d1e4555fd0a6430db2a55a23760f045c33ab4d0ca55
font_01_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 21380 bytes
SHA-256: 36d2786d8b0b3910ee6adb3424c81aaf63b7e3e369474f1eb99397faacc3e9b7
font_02_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3