Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9f7056c9270eb6…

MALICIOUS

PDF

69.2 KB Created: 2021-01-17 14:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 58c77e262e058a2d02998d57539f6e4f SHA-1: 975c5b92ac213585366782e6bd06ddf0dd63c4db SHA-256: 5a9f7056c9270eb63ec91e6df25243e8c47b2a885c1230cab8d961b97176ad76
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, containing numerous external URLs pointing to PDF files hosted on various domains, many of which appear to be disposable or compromised. The presence of a `utm_term` parameter in one of the URLs suggests a potential phishing or SEO manipulation tactic. No scripts were extracted, but the PDF structure itself is used to host and link to other potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=klasifikasi+anemia+pdf PDF link annotation
    • https://tamosumedov.weebly.com/uploads/1/3/4/0/134017363/kaxofisu.pdfIn PDF document text
    • https://boloxekovo.weebly.com/uploads/1/3/2/6/132681585/4655462.pdfIn PDF document text
    • https://site-1174757.mozfiles.com/files/1174757/t_mobile_store_number_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471083/normal_5fa478737e119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f8b15c61b1ba.pdfIn PDF document text
    • https://mojipidu.weebly.com/uploads/1/3/4/3/134391160/gazosonakexowam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480589/normal_5fb29afdf0fba.pdfIn PDF document text
    • https://site-1175497.mozfiles.com/files/1175497/space_engineers_warp_drive.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/5793afee29327b.pdfIn PDF document text
    • https://disanelazutiwi.weebly.com/uploads/1/3/4/3/134361230/potaxezej.pdfIn PDF document text
    • https://site-1171511.mozfiles.com/files/1171511/flickr_app_download_apkpure.pdfIn PDF document text
    • https://site-1177918.mozfiles.com/files/1177918/al_quran_apk_android.pdfIn PDF document text
    • https://vikakexotokipo.weebly.com/uploads/1/3/0/9/130969200/73cbebc.pdfIn PDF document text
    • http://gevixadita.22web.org/amd_760g_chipset_driver.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobulowigewimu.epizy.com/don_t_panic_piano_sheet_music.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/gosedojitekalobekekimis.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 5124 bytes
SHA-256: e301e41ec86d5ca7a5873ea7d79484d9c039824e9c07e7c36aa0ed1950ea39a3
font_01_sfnt_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 10536 bytes
SHA-256: 522273dbc41b218e588ccf148f50a08780b5e94c7a6357c05a991d25160a7df7

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