Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c6d6d15b6ff2be…

MALICIOUS

PDF

75.8 KB Created: 2021-03-11 16:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 09ac3038c19cd876a8f0876abaef2de5 SHA-1: fb754fb1ca184db428391f9eb7437d30f7dc4206 SHA-256: 74c6d6d15b6ff2bed84d741498dcbfc6ec78d0bf3a3d30288f63c99896689baf
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document is designed to redirect users to a large number of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=big+nate+blasts+off+ending PDF link annotation
    • http://ru-en.xyz/983632355462zvhz.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/gjjaibK/hello_neighbor_2_alpha_1._5.pdfIn PDF document text
    • http://quickpapp.online/xelis2eoa3.pdfIn PDF document text
    • http://callup.today/spy_training_camp_shark_tank2p37l.pdfIn PDF document text
    • http://romigeguwapefi.22web.org/77305752537.pdfIn PDF document text
    • http://zizuvajutenuvun.22web.org/rekizoribinilumemum.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/dWuZdoR/mlb_playoffs_2020_bracket_predictions.pdfIn PDF document text
    • http://laithub.pro/30971904971wdnnl.pdfIn PDF document text
    • http://netolenogafa.getenjoyment.net/the_payment_of_bonus_act_1965_mcq.pdfIn PDF document text
    • http://risonubokedoxav.scienceontheweb.net/prefix_suffix_root_word_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotuxegusam.epizy.com/symbicort_budesonide_formoterol_adalah.pdfIn PDF document text
    • http://mutodilevo.epizy.com/zusomosodufugimumatuvoga.pdfIn PDF document text
    • http://dolipefutulej.epizy.com/akshara_song_badhai_ho_badhai.pdfIn PDF document text
    • http://solazum.epizy.com/protestant_amharic_bible.pdfIn PDF document text
    • http://nimetegukixiz.rf.gd/sacroiliac_joint_dysfunction_and_piriformis_syndrome.pdfIn PDF document text
    • http://bememikat.onlinewebshop.net/cyberpower_1350avr_beeping.pdfIn PDF document text
    • http://kufalogomisag.epizy.com/english_malayalam_dictionary_free.pdfIn PDF document text
    • http://medesawawolujim.epizy.com/bsc_cbz_notes.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_off0000eb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB81 5168 bytes
SHA-256: ba5f8a00df26d458afbd5ef133b4c97d07699c5c9f86a300b2e5c0c0b631a54e
font_01_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 10784 bytes
SHA-256: f9e8e4962211c34f67474f841db1b4cdd10fc937e1f744716b7d827069fe6592

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