Malicious PDF — malware analysis report

Static analysis result for SHA-256 da14c122331c1f37…

MALICIOUS

PDF

77.4 KB Created: 2021-03-25 18:27:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6f821e86615f38f12cf7f652b9e0ba9b SHA-1: 207f99f8b060db69949daf939f0a5a5085709c0e SHA-256: da14c122331c1f370f6952297feecfb8705820eb2f8993611f0415b4fe345031
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The document body is heavily obfuscated, but the presence of embedded URLs and the overall detection suggest a phishing or malware delivery attempt, likely using a spearphishing attachment vector. No scripts were extracted, but the malicious links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://yafferge.ru/wix?keyword=adrian+shephard+combine+overwiki In PDF document text
    • https://static.s123-cdn-static.com/uploads/4386839/normal_5fca97e008f32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5ff0c34d719e6.pdfIn PDF document text
    • https://cdn.sqhk.co/besewixogiv/hjZ3Vgj/reporting_interactions_in_logistic_regression.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/aiajjgt/virtual_classroom_templates_for_teachers.pdfIn PDF document text
    • http://xekalabaxuv.medianewsonline.com/ankle_theraband_strengthening_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/AWSCgcw/77744890637.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/86237053901.pdfIn PDF document text
    • http://zemawage.22web.org/overtime_worksheets_samples.pdfIn PDF document text
    • http://tawokurabugo.22web.org/children_s_action_songs_video_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/cGZohfH/comicstaan_season_2.pdfIn PDF document text
    • http://sakaxek.mygamesonline.org/konewemaximexepazo.pdfIn PDF document text
    • https://cdn.sqhk.co/pabukerofo/gicgj1W/68836804684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385412/normal_5fe3f52c69511.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_17723dc5498342af8b6e35712a43ae55.pdf?index=trueIn PDF document text
    • http://japinoxizidunub.myartsonline.com/replace_with_new_imaging_unit_samsung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd0d4a1-4733-460b-96c6-c6057a0d2b9a/big_green_egg_eggniter_charcoal_igniter.pdfIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_67c18dac67eb477c8cc30ee37147e20c.pdf?index=trueIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_f97f976a467a4e93aa0fcf9def9980f2.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_18215748ad33453ab3aad9faa4345635.pdf?index=trueIn PDF document text
    • http://torejejowomu.myartsonline.com/gaxitazajagewalet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582f2cdc-750d-4942-8e70-03bcf7c991d1/dowufixorebizekar.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_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 5628 bytes
SHA-256: d226582ba6d523436153bf551e465317fcdaf32542d0b72a5f79c9bf3479cf77
font_01_sfnt_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 10416 bytes
SHA-256: 69d3f2f32185648eb88360bfdc8c6d9f7814d763ffeabea08a73c04d6bedce28