Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac19ad57520e62f…

MALICIOUS

PDF

77.5 KB Created: 2021-05-29 19:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 11a0e48c59cbd3780d7af344f0ca4615 SHA-1: 507947ac9ee27c7d3b42283eb5c4563031c5ce50 SHA-256: 7ac19ad57520e62fb19175ed0a52bf4ae892094354998c32b7a2c14b2437176c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it likely contains exploit code or phishing content. The presence of a large number of external links, including one pointing to a known malicious redirector, strongly suggests a phishing or link-farming campaign. The document body appears to be malformed or encrypted, preventing a detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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=tapping+auto+clicker+for+android+6 In PDF document text
    • https://nusisudarebo.weebly.com/uploads/1/3/4/3/134349377/volodugate.pdfIn PDF document text
    • https://botefajom.weebly.com/uploads/1/3/4/6/134690565/ccddbaa540824.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/5414558.pdfIn PDF document text
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/de05952e8.pdfIn PDF document text
    • https://kogezuzoxato.weebly.com/uploads/1/3/1/0/131070880/nizitegi.pdfIn PDF document text
    • https://daxogane.weebly.com/uploads/1/3/2/8/132815110/xivuzam_fixazofu.pdfIn PDF document text
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/nojebef_nikeroze.pdfIn PDF document text
    • https://fadukopita.weebly.com/uploads/1/3/1/8/131856205/fuperanofo.pdfIn PDF document text
    • https://werikaduf.weebly.com/uploads/1/3/4/4/134483952/gibibuposazonojawa.pdfIn PDF document text
    • https://dozofuwel.weebly.com/uploads/1/3/5/9/135960373/nikezurajedo_porefijedide_ruboruvaxaxerub.pdfIn PDF document text
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/9ae6c05.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/b0246d4b.pdfIn PDF document text
    • https://votokivefanatu.weebly.com/uploads/1/3/1/4/131453133/zoganugulepaxe_pijog.pdfIn PDF document text
    • https://nirotobilimob.weebly.com/uploads/1/3/4/4/134484477/wotejonoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee650833-7a27-4818-8ff7-4088986cc8aa/element_32_inch_tv_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeea4c01-1160-4238-8af8-4c8b266e4f70/pafibajolilol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5bf5cc-8d67-4c4f-ab07-980d82bf242e/jabegonazijagaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c7d63e-f93a-42da-b4af-bf90dcaf8156/polaris_ranger_1000_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc5ea30-7f9e-4844-bedc-9b995d5da6c4/craftsman_planer_molder_knives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ac4bd6a-be2b-4547-bf8a-d57f4165b6b3/tokulelozubofagimexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13db7604-7568-432f-90ac-ace8700e86b1/6062689695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f6adb1d-cfe5-4c54-9e44-69ef39619097/dazerijivowezumatab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31890a78-ff3d-4d7d-9037-b9c02a7112cb/how_to_use_a_miller_syncrowave_250_dx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1d890f-61e1-4668-8532-eb1e964f6024/how_does_siemens_thermostat_work.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_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 5312 bytes
SHA-256: a8af3a43f3c092506f5b6dc2933ab4422cc2874f9cb4ac5ed3591284285afbb3
font_01_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 10432 bytes
SHA-256: 7d3c98c03f3e43cba527ef38fd2a86dbbbe20c1a86cb5aa16a3af052154ab6d7

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