Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bda69d4f7d827c1…

MALICIOUS

PDF

70.2 KB Created: 2020-11-19 18:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e1fcff55595241a5c2b26948bebfbf23 SHA-1: fe6383b95d75d9e9c2220fe428b13b793b0b30f4 SHA-256: 4bda69d4f7d827c1e59b7e12dc3cd4ac9f7a84d506a3b881cf631634246815b6
274 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple critical heuristics for malicious redirector links and brand-impersonation credential phishing, specifically impersonating USPS. It contains numerous links to external PDFs, likely forming a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL used in the phishing lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vapesokon.weebly.com/uploads/1/3/4/3/134329795/mozikuwon-metofimexu.pdf.
  • 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://gettraff.ru/123?utm_term=703+area+code+location+california In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5fb2b68b00648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461761/normal_5fa5bc7daec2b.pdfIn PDF document text
    • https://vapesokon.weebly.com/uploads/1/3/4/3/134329795/mozikuwon-metofimexu.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://s3.amazonaws.com/xelimewat/living_clean_the_journey_continues_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/best_of_the_best_3_fight_scene.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/bifijudofup.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/editable_award_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3d727f-200f-485d-bea2-07cf985177e2/rugititozu.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/ardex_a46_technical_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/mevevakebo.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/8356588199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3343b786-526f-451c-b193-02a236e744f0/88510702371.pdfIn PDF document text
    • https://s3.amazonaws.com/popagexexoza/my_hero_academia_season_3_episode_16_dub_free.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_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 4916 bytes
SHA-256: c3cdcf5b9d8f1f3d1154c809bdabc8232047bbf96cdfe537dac90f5b2302460b
font_01_sfnt_off0000db65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 10144 bytes
SHA-256: a8fa76cb9b6aea45a273fa838c5dcbc9b4590ec5539337b2d9996919babb1aa5
font_02_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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