Malicious PDF — malware analysis report

Static analysis result for SHA-256 548abf85194ee660…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 12:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fb5f1375975509d23a88d3b74f542161 SHA-1: 32cecf448b6dcae7cfa4245454100a6ef7a6b1bd SHA-256: 548abf85194ee6603954549585c5b0b3e5fdafd990d59c2c69668254d3a1efae
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 0.9997

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://midufefew.ru/strik?utm_term=is+jenn+air+a+good+dishwasher PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391921/normal_60546d373ddad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477629/normal_5ffbb1c819521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_604a57fc7629b.pdfIn PDF document text
    • https://kazajibabagak.weebly.com/uploads/1/3/4/4/134467412/fegomum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481272/normal_5fd0e1c788b77.pdfIn PDF document text
    • https://tupenozisi.weebly.com/uploads/1/3/4/0/134012303/lojap-kapana-jafudegebolij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_686b0686b227454f84f0f4d45307adb6.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_4720516eafce4233baac9f166341ac5d.pdf?index=trueIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_cba70cf0a5794b46a667defe0dec4611.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea0bf6e-e675-49ed-9dcb-9cd28358252f/ejercicios_de_razones_trigonometricas_en_triangulos_rectangulos_resueltos_doc.pdfIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_deddf02f77b2432cb017db6dc739eb1f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f431067-f5ac-459b-9377-ca79a4b48375/can_i_get_amazon_prime_on_roku_streaming_stick.pdfIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_e859e12a04cf4d52b73bd387b327ed2a.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_e39b4ee316d6408eb253779eadeaf6fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/nomexofuguteposagaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4718a8de-f36d-49c8-bbfe-b41b9b0f8564/95689236397.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/how_to_connect_both_jlab_bluetooth_earbuds.pdfIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_f483c0ba9da84b3eb599c2000262d990.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4805d05-2066-4283-b124-07daae321c21/what_conditions_does_hyperbaric_oxygen_therapy_treat.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/jafejukopivanuxab.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_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 4868 bytes
SHA-256: 3a0d1a5298fe5ee43b9b9b6c0b69bf4ad8b6bd2a51a0e7cf65edc0cfc24cfeb1
font_01_sfnt_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 11308 bytes
SHA-256: 00e0573854d6a719da70b686e25b9404343be1f703795ca34b3c9e02df8b14a5
font_02_sfnt_off000122f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c