Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1a3301c087b038…

MALICIOUS

PDF

73.4 KB Created: 2021-03-30 10:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cd53692ec081a5d4197616084beadf30 SHA-1: b004cd9bed0357ab6f4f5e220baad7722ce8f462 SHA-256: 8d1a3301c087b038357a3fe396524c0ec83a113fe48b2460f4cfdd741ea133d0
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and a heuristic indicates it's a link farm designed to redirect users. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=bitsbox+activity+book+pdf PDF link annotation
    • http://jadebey-x.com/rj45_pinout_a_vs_b2yep7.pdfIn PDF document text
    • http://investmag.org/evinrude_e-tec_115_service_manualk3i8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5fd8140bce738.pdfIn PDF document text
    • https://cdn.sqhk.co/pegiridireva/adbjdcg/11775857648.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/vkjieF8/95042157612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_600aa5a387df4.pdfIn PDF document text
    • http://prolac.ru/inquisitor_martyr_guide6ay23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_603438f5b7be0.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/hc9hKji/52853525597.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/pjaoNhi/16162705924.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/hi8jfhh/20346208143.pdfIn PDF document text
    • http://agent-spv.space/nalamemutidigisiwozijigo3obut.pdfIn PDF document text
    • https://cdn.sqhk.co/gilitejeku/qCUTxjc/jexelirotapuwaroluzazox.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://uploads.strikinglycdn.com/files/bf4bf0fa-435a-409c-8aec-dfc47ef86fc1/92965860989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4859df76-c1f6-44dc-940e-3fe016d268f9/e3_spark_plug_for_troy_bilt_tb110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/209c96e2-99b9-4ae2-b295-10de6b349c0d/vizozefuwikubuzofikogil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc4653a-3920-4523-8bb1-9b4b880d9a1c/what_is_average_household_income_in_toronto.pdfIn PDF document text
    • http://ruwukag.epizy.com/93400677924.pdfIn PDF document text
    • http://depevabevidot.rf.gd/eternal_city_building_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/169590e7-c940-40f1-95d8-21f5a336534d/how_to_prove_creditable_drug_coverage.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_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 5068 bytes
SHA-256: 6d967a504790364b8332db2c3ad7df9f9487ebabd13ec9b816ac06c704262e99
font_01_sfnt_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 11008 bytes
SHA-256: db429f7b782bdd1f0f754c50d46529fc3cf5616eda1334b3e3e1a71eaa34f35c
font_02_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176