Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4e5b6f0136f0a6…

MALICIOUS

PDF

80.0 KB Created: 2021-03-31 10:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c83ba966fd293b6681cb1e44e108b888 SHA-1: 186b9b48f20a8659dfb41bf50e1753861f0bf122 SHA-256: ad4e5b6f0136f0a615fcc2508fb023a243cc5c1e69a010a48f8adb68d216e6c5
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of embedded links, many of which point to disposable hosting services or known malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically identified a link to 'https://crophysi.ru/strik?utm_term=cyberlink+powerdirector+15+activation+key', indicating a phishing or malware distribution attempt. The ML classifier and ClamAV also flagged this file as malicious, supporting the assessment of a phishing or malware delivery scheme.

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
  • 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/strik?utm_term=cyberlink+powerdirector+15+activation+key In PDF document text
    • https://pebuxunuvir.weebly.com/uploads/1/3/1/4/131483235/8e156db.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/ahacq8M/3249454095.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikewe/bKifPKS/stickman_fighting_3d_apk.pdfIn PDF document text
    • http://levantegroup.net/hermann_hesse_steppenwolf_movieenl13.pdfIn PDF document text
    • https://cdn.sqhk.co/pulafefer/de5UCjs/vabotitodikomuniwe.pdfIn PDF document text
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/kegiledazifosa_lexuzomikaga_sazik_favifi.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/jc4iehp/neha_kakkar_songs_ringtone_download.pdfIn PDF document text
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/toruburemur-vufode-dujisofuwe.pdfIn PDF document text
    • https://tekaxudifen.weebly.com/uploads/1/3/5/9/135992886/dikutam.pdfIn PDF document text
    • https://cdn.sqhk.co/murefazomejo/hgdjibl/chicken_shop_and_dirty_burger_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/sixojifez/mZCHjha/monster_bingo_game_instructions.pdfIn PDF document text
    • http://goodsun.fun/74399650334s31d0.pdfIn PDF document text
    • https://dotitikedobe.weebly.com/uploads/1/3/4/4/134493035/fewexuke-jobewikotu.pdfIn PDF document text
    • http://detonicro.website/49378753017cjout.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/10105247851.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/suwedavadulaxarefov.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/esperanza_renace_resumen.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/paxizunugoronejomit.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/bdd_scenario_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71eb24ee-efa4-4399-924d-7881a72d3f08/how_much_is_newsmax_tv_on_spectrum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f107f2e-15d2-4ec4-814e-19e5e0f47636/citizen_gn-4w-s_set_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57ce560-572d-4b42-a17b-2a3a5e2fd6c6/jawbone_up2_instructions.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_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 5428 bytes
SHA-256: 1871aec35e8496766ef6d921f08cdb1c13729e9993a9ed65f7c343dfa9dacc17
font_01_sfnt_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 11524 bytes
SHA-256: 78e045be7d9a22906de87ee4ea36e379944d16ec005d3bf6fe6ca58a9f210e81