Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca94808984509f0…

MALICIOUS

PDF

85.1 KB Created: 2021-03-21 10:59:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e51be1e40b30f7f9c70694f962e28cee SHA-1: 5183b79e1684c74ac117014c1b7504198ed013c9 SHA-256: cca94808984509f0168fd06c985c6cf58f212715e4fbbb39ef09964fb30566a7
244 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, including known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://dafemum.ru/award?keyword=adverb+phrase+examples+pdf In PDF document text
    • http://wijetaz.mypressonline.com/does_dunkin_donuts_have_doordash.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404738/normal_5ff794b31de7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_602f1137ce1da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413000/normal_5ff949a26a3c8.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/viper_car_alarm_stopped_working.pdfIn PDF document text
    • http://wopexobow.mywebcommunity.org/ssc_stenographer_2020_question_paper_with_answer_key.pdfIn PDF document text
    • http://rimiripa.mypressonline.com/suguwumifunepibov.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/94598430027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488090/normal_604b1bf17583c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415519/normal_5fe29406cdb09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_ec38ba8fb1934dccbdfa32821968f295.pdf?index=trueIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_b45789bacd7e491c9774ccd3ce72f0c7.pdf?index=trueIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_176277547a474c50a9bca1584e3976ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/dawajiripewon.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_1d53f0a260d24de8b53104a43c92b468.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/kazezimabobubo.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_bd8ac2c0cf8d4e3a8239f8de0e1f7cab.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_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 5540 bytes
SHA-256: 0586d1581f6e6f7ff9e1ca6f36c44a546a24cf716d693c3b696f209c6d060523
font_01_sfnt_off00012137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 11704 bytes
SHA-256: f933388c973c8806661f95c9a8652bc9d9b227d1882495e09f9a66ff929faca3

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