Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb86b173e13cef0…

MALICIOUS

PDF

95.7 KB Created: 2021-04-04 03:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 01c8f2844f9923b07fa5130f6215649b SHA-1: 0a5336dfe3764d9e5bf6d3749c661417f95fc286 SHA-256: bcb86b173e13cef0beb61f888292f6337b9137e63a8049ce436d5bde80d0cf12
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to disposable domains, a common tactic for SEO manipulation or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a 'download' button lure further supports a malicious workflow, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/wix?keyword=surah+for+healthy+body PDF link annotation
    • https://tugoxalimirufa.weebly.com/uploads/1/3/4/3/134310877/8cafcb71af9.pdfIn PDF document text
    • https://jivetigaforivuj.weebly.com/uploads/1/3/4/3/134350389/talefar.pdfIn PDF document text
    • http://1freedom.space/passport_photo_template_a4qz1du.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/chdIxO0/super_adventure_of_jabber_download.pdfIn PDF document text
    • http://wawimetuboze.iblogger.org/cavum_nasi_adalah.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/IgfBJWe/fuzagimipesizi.pdfIn PDF document text
    • https://cdn.sqhk.co/jasuxerazifo/dhcgeP6/nekodurefelefanumadase.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/fchgjfj/27716037659.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/fijgi9V/indoor_skydiving_houston_woodlands.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/jaijihg/42207101580.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/Dgegdjd/zafegasutiso.pdfIn PDF document text
    • https://vavozeja.weebly.com/uploads/1/3/5/3/135308761/5473e111ee.pdfIn PDF document text
    • http://svoydvalend.xyz/41999628516i91at.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/YOJgeOj/second_galaxy_iphone_review.pdfIn PDF document text
    • https://luloxewawi.weebly.com/uploads/1/3/0/8/130874123/008b19e21a896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zosusakadutadi.epizy.com/acute_ankle_sprain_exercises.pdfIn PDF document text
    • http://bejevevofo.epizy.com/zawazoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013bcb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13BCB 29116 bytes
SHA-256: 30fb8d7fa16205c2eee84b9c18dc59ed95f998e35656c4c09d942f15bedd53ff
font_00_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 5164 bytes
SHA-256: e7db9d0e6a43d2c81e98012feb953501c23c9d78d928a7fc1b70a4672f4a7724
font_01_sfnt_off000116c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 10832 bytes
SHA-256: 5e46ed630c7121bd80c4ce4759983853d022531f9ad1631af2401d1ac0f5f826

Open this report in the interactive analyzer, or submit your own file for analysis.