Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ff05b1ad07c31d…

MALICIOUS

PDF

77.0 KB Created: 2021-01-30 00:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31726386b718ac43bce0ccb55dd71979 SHA-1: ddf6460f8f061605ed66af067d699957cd744669 SHA-256: 73ff05b1ad07c31d669fa92afb703c665cbd1c281ec25905ade115853f463b3d
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirection suggests an attempt to lure users to a malicious site, likely for phishing or to download further malware. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=devondre+beazley+sentence In PDF document text
    • http://tukazijib.22web.org/java_full_video_tutorial_free.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/hcJhfhb/nintendo_switch_brain_training_canada.pdfIn PDF document text
    • http://twoup-viktoria.online/zeresulexuzodagulijo5zfca.pdfIn PDF document text
    • http://theboldpantsproject.com/xaseroxie52yi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490371/normal_60145a706d252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_5fda9113be35f.pdfIn PDF document text
    • http://bubuwem.iblogger.org/zasukosikonajidipanawe.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/2iehdBL/zombie_survival_last_day_2.pdfIn PDF document text
    • http://technodom11.com/bomokezasoburajcnodw.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/jbE3p4o/amazon_fire_tv_stick_4k_model_number.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/gdjd7ie/43334785714.pdfIn PDF document text
    • http://fusubakitakudup.66ghz.com/cinema_app_for_android_free.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/bizamesuwepe/budget_bytes_meatloaf_sheet_pan.pdfIn PDF document text
    • http://wuduzinemaz.rf.gd/75592149042.pdfIn PDF document text
    • http://zubeleboju.epizy.com/80692520825.pdfIn PDF document text
    • http://keruxenuriwi.epizy.com/algorithms_in_c_robert_sedgewick_github.pdfIn PDF document text
    • http://nifibomagogov.rf.gd/25047452391.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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 5024 bytes
SHA-256: 9a3fadfcaf9611f3f952865749e54aada6ec62e1f01746f046b6c962cacd7469
font_01_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 10636 bytes
SHA-256: 89571c396c107d442ef9a1725f6909f49b12b31ff5f6d53a4dd4ecc010e49967
font_02_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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