Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aefabefbef5b7c3…

MALICIOUS

PDF

77.3 KB Created: 2021-04-01 15:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3c1e3e18c2c29bb46a21171198875ccb SHA-1: 99bce60abe9650ca146c50fc2a023b01c382fbaa SHA-256: 4aefabefbef5b7c366a4e6ba6a9568b35b2cd2e1896bbb91c89888d7a263f75b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The embedded URLs suggest an attempt to drive traffic to specific websites, potentially for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=7th+grade+math+map+test+pdf PDF link annotation
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/9578795.pdfIn PDF document text
    • http://ryduslim.website/craftsman_2500_psi_pressure_washer_pricevbmax.pdfIn PDF document text
    • https://rofowijajexer.weebly.com/uploads/1/3/4/4/134476616/6716329.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/craftsman_electric_chainsaw_-_12_a_-_16-in.pdfIn PDF document text
    • http://wupevijijoze.mygamesonline.org/devizimupigumezi.pdfIn PDF document text
    • http://dibosezufo.getenjoyment.net/11186807073.pdfIn PDF document text
    • http://conicppjry.bid/raid_shadow_legends_youtuber_codesj7hp7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_ec5ee68a4a81442aaafcca47268db62d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/466edb3f-5738-402f-b878-f03c51c9df36/fidamutokavamobugakabage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c29ee99-90ad-4e90-80c5-0517acef1095/how_to_get_rid_of_call_forwarding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b99856-cf83-42dc-be77-8983f39347f7/kubota_l3130_front_axle_oil_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5dc380-3cbb-42be-a982-73ce370efc08/beautiful_creatures_2000_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71145bea-dd02-4e0b-9c0d-e8c7a8721ed9/23630684838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da43534-0758-4b9f-a64e-d75bf411b22f/44163615508.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_a1f3a7b804a24250bd204ffa85567e48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dad9254-e2c8-4625-89cb-ceebe863c5c9/android_app_development_ide_online.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_41fe0292792541f4896a559168c1e8be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b63033-dfde-4aca-9bb7-b004d0521c98/sony_str-dn840_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b43ce21-5721-477d-a8a5-34c038b6eb60/23949709057.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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 5408 bytes
SHA-256: e35e829ab535fe367973d9cd23b12f4d023a3c67a971eaeb83c0d8898cd264f8
font_01_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 11480 bytes
SHA-256: fe1c645f7a32a3a7eb2b6191a1920657831e108cdf845c13fe83fe529c1381fe