Malicious PDF — malware analysis report

Static analysis result for SHA-256 453ae2bc0ec8fb01…

MALICIOUS

PDF

83.5 KB Created: 2021-04-03 12:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9e903750426f0752e95241fcaeeec036 SHA-1: b51403891d884a0361bde4f7671ff03fc853e108 SHA-256: 453ae2bc0ec8fb01760396c938bedfc56a74909bc5ab368ffe64876392020f57
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with critical heuristics indicating it's a malicious redirector and a link farm. One critical heuristic specifically flags a link to dafemum.ru as malicious. The ML classifier also strongly indicates maliciousness. While no scripts were extracted, the sheer volume of links and the malicious redirector detection point to an attempt to lure users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/wix?keyword=bloons+tower+3+strategy In PDF document text
    • http://kagaromorin.medianewsonline.com/biblical_interpretation_of_dreams.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/xemunamowidal-vagarufi-patuvot.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/30132431156.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/45338840166.pdfIn PDF document text
    • http://magicwoolshop.com/rebolalur3utg.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/voruf-vikos.pdfIn PDF document text
    • http://fofafik.iblogger.org/gegaviduro.pdfIn PDF document text
    • http://erethiztzj.space/rerubat21dsz.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/blackball_rules_2020.pdfIn PDF document text
    • https://mafidusat.weebly.com/uploads/1/3/4/1/134109097/d49fc507.pdfIn PDF document text
    • https://zumugerajezu.weebly.com/uploads/1/3/1/1/131163828/dibefat.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/how_to_boost_the_left_side_of_your_brain.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://tupakewufitid.iblogger.org/calculus_early_transcendental_functions_4th_edition_solutions_manual.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
    • http://riwofepijisanet.epizy.com/xoxix.pdfIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_e939775d130647c6be885126588a4954.pdf?index=trueIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_0442be8670bc45549160dac078bde24c.pdf?index=trueIn PDF document text
    • http://zepivukimofer.epizy.com/60985302111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfe6ab65-07cb-4d92-b536-77a3b012a902/harrisons_manual_of_medicine_20th_edition_ebook.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_553e6da05ef948248a3fbb28605dc498.pdf?index=trueIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_7e35f0444a584d35b42919b5cd19f9d0.pdf?index=trueIn PDF document text
    • https://74bb8966-1fc2-43cb-a641-24c20f380d28.filesusr.com/ugd/84c7b5_bc94e31682ff462a870820fce4a380f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa5ec21-7ab5-4a8f-8424-4880b6e2adc2/english_grammar_learning_videos_free_download.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_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 5000 bytes
SHA-256: 58ddd5d0a09cda61212dee6b333d032ab2dc049028ca9296ec85c166cd0bbe0e
font_01_sfnt_off00010baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 10988 bytes
SHA-256: 6311dbca47666e2814a7d27aff3f5bc43d6d8522e165018bd03451ed71d55ec9
font_02_sfnt_off00013166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361