Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6eab76c881b5cd…

MALICIOUS

PDF

74.6 KB Created: 2021-03-28 18:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ff47ca1d332161777a171f31832b5e4b SHA-1: b098702596ca171d54bf400faca2c06f278b9b43 SHA-256: 8c6eab76c881b5cd10977a7e9720d435a894ac7a889228a5e4f5c24fab74a858
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 domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=opera+mobile+apk+gingerbread PDF link annotation
    • http://lorewipa.scienceontheweb.net/can_you_whitewash_wood_floors.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/82510097741.pdfIn PDF document text
    • http://zawopim.mygamesonline.org/ankle_sprain_physiotherapy_protocol.pdfIn PDF document text
    • http://mogisut.medianewsonline.com/dell_r740xd_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/sekopanosesu/h8ia6jc/73830077819.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/constitucin_de_venezuela_1830.pdfIn PDF document text
    • https://cdn.sqhk.co/jonuwezipagi/hehjhdh/jifaretomemogunenobojokut.pdfIn PDF document text
    • https://cdn.sqhk.co/zitiwofiru/Highf4a/bepoluf.pdfIn PDF document text
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/9348273.pdfIn PDF document text
    • https://cdn.sqhk.co/lowanivari/p9Cangd/27301522423.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/6273567.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/9Cgjr8n/62993130519.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/faluzotixupi/jijonezerur.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/regopigutobowigepobire.pdfIn PDF document text
    • http://wizigipixe.atwebpages.com/molar_ratio_worksheet_answer_key.pdfIn PDF document text
    • http://zuputes.atwebpages.com/ccrn_pulmonary_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/bharaate_songs_w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b3145c-f04b-43f6-8f01-693e0f9d9a9d/nesogebuloj.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/fubegugabatalafazawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1b9541-25ae-41e5-8082-a739627d85ac/samsung_tv_6_series_have_bluetooth.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/40900525351.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_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 5332 bytes
SHA-256: f50dc302c328cfe4f30cf811fe90344555c4d06853b7a82d63783aa67609d417
font_01_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 3940 bytes
SHA-256: 67925314b544d55422fd711f3f5f05b05cdd73a5884e296a2c21b4803829718b
font_02_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 11380 bytes
SHA-256: 2441f21a467a1e2917790bc2d21f1dbac6d2d35413b657de4e8c1be46574880d