Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f484c08fb1ae8c8…

MALICIOUS

PDF

85.2 KB Created: 2021-04-25 04:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d27418c373eb7b1e2b68b83f45daa504 SHA-1: 57ded2eff6bb2091aee149d074e5d4fc18e8b7d3 SHA-256: 1f484c08fb1ae8c8bbb12e3550845381ab56bbd8e58bd596ee254d4af3df5b01
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://resalured.ru/strik?utm_term=is+apple+home+kit+free PDF link annotation
    • https://cdn.sqhk.co/tezofugowura/gh2acgj/survivalcraft_2_future_updates.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/falejuketerekopogese.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/hfRid71/my_block_tupac_mp3.pdfIn PDF document text
    • https://kibodoru.weebly.com/uploads/1/3/2/6/132695707/1101482.pdfIn PDF document text
    • https://dukikabapesudux.weebly.com/uploads/1/3/4/1/134108868/80943d57.pdfIn PDF document text
    • http://libralab.digital/what_are_the_seven_basic_needs_of_all_living_thingsbmyqr.pdfIn PDF document text
    • http://dimax.website/c_est_fini_la_comedie_pianorj273.pdfIn PDF document text
    • http://mon-fortuneo.best/lifegixovaxasituvonuxatuvciltm.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/60154134862524ul.pdfIn PDF document text
    • https://cdn.sqhk.co/xekawiba/gmwnicl/huey_helicopter_vietnam_war_photos.pdfIn PDF document text
    • https://denuxikunoleluj.weebly.com/uploads/1/3/4/0/134018299/wevedama_pagilemaxefuw_jesufolo_zijoxin.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/itqM7UN/bubble_candy_game.pdfIn PDF document text
    • http://silvanozito.online/lugowu5riip.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/jyhgS8p/anime_boy_pink_hair_pinterest.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/e1c98891-619d-46c2-809e-892c9ff355a2/is_2010_lexus_rx_350_a_good_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48421f15-9fe3-45a4-8b07-49ca97864cc3/rerabalobobuzakalefipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f41e04e-a08f-4953-83b2-abe3ceac1d3c/only_the_paranoid_survive_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71280a89-e04c-44a4-8eee-9d175c75ee2c/94540068811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de8005db-ebd9-498b-8dbd-032ef1bce324/ruud_silhouette_ii_not_lighting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e753a21c-771a-4e0c-ac7a-ae6d2e24bb76/second_order_derivative_exponential_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e8ce3b-4252-4354-b22c-dd05c8884a28/65243330951.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_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 5140 bytes
SHA-256: 54e4da60b409382a51a25b0de526aa40aa8c973fbf780715fc461e88894c9a69
font_01_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 11092 bytes
SHA-256: f06489c81f18e1a4b27ac3a07858b3426477935cd18f83ab19917b947c506f93