Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c469bac773ab91…

MALICIOUS

PDF

75.9 KB Created: 2021-03-26 04:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8ee9e2dc9dabf07ef3723f01a54de279 SHA-1: b70ea136d5d819320c9a97946c0a3454c731b25a SHA-256: 57c469bac773ab91372f46df64c0afe5b8d4ba3a87b77814d850887db46fac51
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file is classified as malicious by ML and ClamAV, indicating a high probability of malicious intent. It contains a link farm with numerous external links, many hosted on disposable domains, suggesting a phishing or scam operation. The document body, though partially corrupted, contains text related to 'application for employment insurance benefits pdf', which is likely a lure to entice users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=application+for+employment+insurance+benefits+pdf PDF link annotation
    • https://bizarejix.weebly.com/uploads/1/3/4/2/134265425/puvogudifatij.pdfIn PDF document text
    • https://fagadiroduk.weebly.com/uploads/1/3/0/9/130969360/7fac8b5a96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409609/normal_5fe534f99689d.pdfIn PDF document text
    • https://demijogukif.weebly.com/uploads/1/3/1/3/131382539/gevek.pdfIn PDF document text
    • https://zurukonovode.weebly.com/uploads/1/3/1/3/131379219/2223068.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/5273088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5fe15193cb52b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484154/normal_60568a524be1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419818/normal_5fe1a546507fa.pdfIn PDF document text
    • https://wunaramalus.weebly.com/uploads/1/3/4/5/134576193/a8723852b1f3d6.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/3148199.pdfIn PDF document text
    • https://rarifipive.weebly.com/uploads/1/3/4/1/134131304/dosumusabakirixumo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421336/normal_5ff195294208b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_1f7b34e9b3094241a27086c6d17776e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/52011675902.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/vigomefivikosolekitozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71e7666-8657-401b-a050-f35376c28b80/what_is_the_history_of_human_trafficking_in_the_united_states.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/puff_pastry_sheets_and_apple_pie_filling.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_29a5c4258d6a429a919c262e064736a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/107b274c-1350-4e0c-9ea9-e1c8f28d2000/harry_potter_part_1_full_movie_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/what_is_the_meaning_of_breach_of_trust.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2a8bee-66b7-42cb-a1cc-f6380a146559/roadmaster_granite_peak_womens_mountain_bike_26_wheels_black.pdfIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_f807d47251064bf28606fb1024695fa3.pdf?index=trueIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_5ac5ed127b694edbbc057c94eecf1db0.pdf?index=trueIn 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_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 5532 bytes
SHA-256: 9eb69d9705471215f7caaaaae52ddcfa4fe4f7aca08c726eab6549e206218fd7
font_01_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 10472 bytes
SHA-256: 6396ed16d6251f66ea3d019c27442c52296f84ed29976ecbfeda401d43379f29