Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8b14c47b5b5709…

MALICIOUS

PDF

108.0 KB Created: 2021-03-18 23:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a8816a52e8dbffb537dcbe5c6918d4de SHA-1: ab4810904c6eca4672d8494818ef7941afb393ca SHA-256: 4d8b14c47b5b570960a297ed77216eaa3ee5109d68b6eb4d375846b9f40f2f57
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which lead to disposable hosting or known malicious redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/wix?keyword=where%2527s+waldo+pdf In PDF document text
    • https://lojigimab.weebly.com/uploads/1/3/0/8/130814508/repoguki.pdfIn PDF document text
    • http://generalmassage.online/gsm_alarm_system_sim_card_in_canada2vc2s.pdfIn PDF document text
    • https://latuxuxapeja.weebly.com/uploads/1/3/0/7/130739017/dacb1e91e8c438.pdfIn PDF document text
    • https://wafumaxa.weebly.com/uploads/1/3/5/4/135400811/8485155.pdfIn PDF document text
    • https://wimazuwog.weebly.com/uploads/1/3/0/7/130740080/77ef967a638c538.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/virofoligesixavuk.pdfIn PDF document text
    • http://daduriwikoniza.22web.org/13992254855.pdfIn PDF document text
    • https://rikinosi.weebly.com/uploads/1/3/4/3/134352476/pilulexobupa.pdfIn PDF document text
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/70cd665aeca.pdfIn PDF document text
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/vuvizovelirod.pdfIn PDF document text
    • http://1s.london/keto_ketones_guidek14nv.pdfIn PDF document text
    • https://punedevoredod.weebly.com/uploads/1/3/2/7/132740204/48b0071832.pdfIn PDF document text
    • https://vuxomikegivu.weebly.com/uploads/1/3/1/4/131453843/toberufoxojo_tizoxaputabogim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://dajivetu.rf.gd/arabic_worksheets_for_kg2.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/zagugop.pdfIn PDF document text
    • http://wakedozalol.rf.gd/support.nintendo.com.error_code_51099_dsi.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/how_to_tie_slip_knot_for_necklace.pdfIn PDF document text
    • http://fotolen.epizy.com/38854925214.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/what_are_some_easy_songs_to_play_on_the_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/chennai_express_movie_video_song_hd.pdfIn PDF document text
    • http://fiwujugisijema.epizy.com/75562143933.pdfIn PDF document text
    • http://buzawasilugije.epizy.com/65777929580.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017a07.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17A07 18108 bytes
SHA-256: c5c9e1ab6ab436c86314e461b9d7e5a049312bef3bbcb8d85d62e316846113e1
font_00_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 7008 bytes
SHA-256: fb5fa1925042895dc3ce6aa9c4923c9912b1f66e7d94af551af491e1897c63d3
font_01_sfnt_off000136f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F1 5268 bytes
SHA-256: e3937fabbf5d3c910148228c923e429e5c98c83130053766cd3fc1e3b9cc3f16
font_02_sfnt_off000148f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F0 15804 bytes
SHA-256: 522498461a38e8b56bc563bc7816c22b8103cf23685514f1331e4d9d9c59b8b1
font_04_sfnt_off000196a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196A3 2740 bytes
SHA-256: 2d17d35d22a938d463fa0e6951e7a3178268bc1686d9ce4ac4a38a8184b0da04