Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf2fe2adc3d4572…

MALICIOUS

PDF

94.3 KB Created: 2021-03-28 10:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f4e03d0661dfe703d81616a99ccdccd3 SHA-1: b01cf629b2dc425a94127126ef89634f259e534b SHA-256: ccf2fe2adc3d45721a78a303721a441bd1cb9d4dd300778bb2bbdbc5dcd7f95f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/award?keyword=business+case+pdf PDF link annotation
    • https://magajasomit.weebly.com/uploads/1/3/5/3/135388043/dodigo.pdfIn PDF document text
    • https://selegisazo.weebly.com/uploads/1/3/5/3/135323244/e69a44db9.pdfIn PDF document text
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/05052.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/monoculture_and_polyculture.pdfIn PDF document text
    • https://wikuxokogex.weebly.com/uploads/1/3/1/8/131872144/zuzilovisimujiwum.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/tumikulisejevekaj.pdfIn PDF document text
    • https://xosipepimebat.weebly.com/uploads/1/3/2/6/132682768/wadizapokagokeruvox.pdfIn PDF document text
    • https://moviwinexanasi.weebly.com/uploads/1/3/4/3/134314602/7ae58c6.pdfIn PDF document text
    • https://xifisipur.weebly.com/uploads/1/3/1/0/131069870/9874085.pdfIn PDF document text
    • https://xuwogufovesuvem.weebly.com/uploads/1/3/1/4/131406895/1701550.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_1f8c7c750bed4027a6813eef54e9dd63.pdf?index=trueIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_56057a5d59e84007a5027b0729b4207d.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_b75408550e764e709c79699088819a10.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_fae19a2b0fb6418bbbda97b3f662e234.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5990e8-c02b-4db9-83fe-baf2bb87055a/58455301388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5811ad-79bf-4bbe-a4d0-75f49d9c624e/is_quartz_a_good_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e2a125-68e0-4427-8c82-f5a575a81e47/maze_runner_character_thomas.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_2491e5068b544fc08bafd2acdbfeaa0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e216b061-e862-49aa-8e8c-9b9b728ee2ef/wipibelulejurenumawef.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_173146d42cd84a90ba6972c8a5f805b3.pdf?index=trueIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_00cadae627b04a54b234dda5ede52f6a.pdf?index=trueIn PDF document text
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_7f25b38a839e4f33b7044ec284649634.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ac5502-9cfd-4875-b892-80866eb45548/how_to_find_geometric_mean_formula.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/70512419248.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_off0001365f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365F 5072 bytes
SHA-256: 5495ae4182232cbf5f65f8b887c51f017fda1ee16068b0764ec65a09dc77caf5
font_01_sfnt_off000147be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BE 10680 bytes
SHA-256: 2647e52e2bd1e3ff53413e800cf626f452b5cf26dd8aad453374bf6f443fdfbf