Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b83650a3e8f99a3…

MALICIOUS

PDF

76.1 KB Created: 2021-03-18 00:37:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d334f5f6c3bb6500ce4b8820386de2af SHA-1: 9999c112d3373640ddb06cd200745c18068fa9ba SHA-256: 6b83650a3e8f99a3629e0e6dd57c10269425c70fc741203c4b3ed5bd6ff63947
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 or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to 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://druttle.ru/award?keyword=data+analysis+software+pdf PDF link annotation
    • http://strgb2.ru/dozogewipakelisubepawoletm8xr2.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/jfqgcgg/fan_of_guns_mod_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/4igheEC/amazing_viral_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/vetipewalu/0jakwhh/rusijug.pdfIn PDF document text
    • http://stroymarketmetal.ru/codex_warhammer_40000zoisk.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/wRhgSib/solar_system_planets_in_order_to_scale.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/4e0aaf8a-25b5-4061-9eac-a29a79cb9ec5/sezilubafujulanidir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9dab90-dd70-4257-9efc-f6502a0d3214/vigadurovabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4150fec-f4a5-414f-81cb-8f93759333f7/fujitsu_fi_6130z_twain_driver_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb2e066-f9eb-42a6-bce1-32f8940dfd42/rewonumonukofewidomupedel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/663cf61c-f8f1-4245-aa38-e5fb79013aee/best_3_day_potty_training_method.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0581a6b8-0816-4e23-a70d-a209f7383bc5/por_el_placer_de_vivir_libro_amazon.pdfIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_19cfd1dc00a24db1a79bec9518722e99.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/95180878473.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_ab3d4780a68246db93bcd284b86247ba.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_332fbc30eb6c4f9cb6eeb101643fcc83.pdf?index=trueIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_c50494bbdb5f42d5830c9b64f6c7109b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jikopot/bravissimo_transformado_junho_2019_iks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d0fec3-ec3e-41dc-abb2-8d833dbc620b/norton_anthology_of_world_literature_volume_f.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_753d3d36b9b04b29bc11461a67dc74fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/751be16c-e623-42a9-ae9b-a97598416e95/what_does_the_myth_of_sisyphus_teach_us.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/luzarixopi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 5228 bytes
SHA-256: c76f20099a1f1674a038ddeaff191346ccf2b297c5c57f9140c5920d0d094ceb
font_01_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 10952 bytes
SHA-256: b640b731020de4fe887f00e53622094487dec34f80c67cdf98be994e29affccd