Malicious PDF — malware analysis report

Static analysis result for SHA-256 d192adbc93b04809…

MALICIOUS

PDF

68.7 KB Created: 2021-03-18 03:10:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5e28e628b889c1f4dcff39a4eb5ac5ee SHA-1: b11e38884518dd0a4853579502543824f8aec2aa SHA-256: d192adbc93b04809266d5ae08dbe32c809be6fcc0e61463ba5c65a0baa5e7b06
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and are designed to redirect users to malicious sites, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary malicious URL identified is https://dafemum.ru/strik?utm_term=samsung+wb35f+price+in+pakistan, which is likely part of a phishing or scam campaign. No scripts were extracted, but the structure and link farm nature strongly suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/strik?utm_term=samsung+wb35f+price+in+pakistan In PDF document text
    • https://moxuranib.weebly.com/uploads/1/3/4/3/134345095/4683986.pdfIn PDF document text
    • https://karinavoru.weebly.com/uploads/1/3/4/0/134017817/88c5b4.pdfIn PDF document text
    • http://lemiritafuwab.22web.org/52245039467.pdfIn PDF document text
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/kujek-pozumogutu-kesoz-penunu.pdfIn PDF document text
    • https://xuvosaxefon.weebly.com/uploads/1/3/4/6/134605895/8dc1b6f730b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jonogib.epizy.com/nogomagamururirawiku.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_1d68c7474dc646d9bbb256d5bbdbca74.pdf?index=trueIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_9371366032e24bb880445738be4a0932.pdf?index=trueIn PDF document text
    • https://b724dda4-e2e0-47c5-811c-ae3b7273578b.filesusr.com/ugd/a1e5ee_e85ac3230e744ad59994e2014af9b480.pdf?index=trueIn PDF document text
    • http://gefifeji.rf.gd/minej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49075f92-dfe9-4f9b-856f-bb7ec52b7efa/how_to_calculate_gradient_of_electric_field.pdfIn PDF document text
    • http://lijomoxanegug.rf.gd/how_do_you_analyze_a_visual_in_text.pdfIn PDF document text
    • http://pozifaganepele.epizy.com/anatomy_of_flowering_plants_class_11_notes_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ece4ab7-d5ab-4a7f-829b-339eb30cdb4d/scary_stories_to_tell_in_the_dark_download_google_drive.pdfIn PDF document text
    • http://nutidefuga.rf.gd/majorokexelawadawamosirak.pdfIn PDF document text
    • http://jijudewaroj.epizy.com/70945403689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f14c53-dc51-4ddc-8229-1b7a85931be6/43134814919.pdfIn PDF document text
    • http://gepobot.epizy.com/gijoj.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_672ee1f3729343bc9547c7f82a6eb9ab.pdf?index=trueIn PDF document text
    • http://gumelojapa.epizy.com/88196089093.pdfIn PDF document text
    • http://mirepili.epizy.com/what_does_open_wod_mean_on_apple_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0ee733-d307-4a40-bf95-eab8f5c0c06a/81064356338.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_off0000cccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCD 5988 bytes
SHA-256: 554448ec69d7463ff370fe98a5dc5fbd089f643a5c2165e7aaa302f980f19369
font_01_sfnt_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 10672 bytes
SHA-256: 1dc09d46cb0e1c21bc22656037a52f424cd07ba8f5ea8c039a7e650090de9ea7

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