Malicious PDF — malware analysis report

Static analysis result for SHA-256 1553c911b0c8bc1a…

MALICIOUS

PDF

97.0 KB Created: 2021-03-28 22:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 20ea0643928fc04a62f9dfb8cc9e1dd3 SHA-1: b2a36325bb99b90ad12d7b2b8c02a9adf25aa93a SHA-256: 1553c911b0c8bc1aaa3f55bb6fef264cb17edd04fd0bc3d945ab64df896df4e8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though partially corrupted, contains a deceptive title related to a news event, likely to entice clicks to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/123?utm_term=former+springbok+captain+dies PDF link annotation
    • https://cdn.sqhk.co/zefafulolit/FlECchf/big_bang_theory_whip_app_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_604bbcfa591ea.pdfIn PDF document text
    • https://cdn.sqhk.co/rafatuvolix/aSgg5EX/48704908581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416510/normal_60385a5ae240e.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/iJgengh/94858389101.pdfIn PDF document text
    • https://cdn.sqhk.co/liwifetil/hbKjaLw/hillside_drive_levels.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_603012fda74e1.pdfIn PDF document text
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/5538248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_5fd9d02dc380a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_6010cf8c6b949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_6045eb49a27b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481157/normal_5fec10902753c.pdfIn PDF document text
    • https://xikigojajutu.weebly.com/uploads/1/3/4/3/134385057/gejufal-mulozegalutori-bawejizefade.pdfIn PDF document text
    • https://nukewunokozekid.weebly.com/uploads/1/3/4/6/134678158/siforadevowede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_60604cb7a26e7.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/iagejj1/40506764100.pdfIn PDF document text
    • https://terogoke.weebly.com/uploads/1/3/4/5/134587715/zudozamo-gusaw.pdfIn PDF document text
    • https://cdn.sqhk.co/nakokixega/giaifnB/rojebadajuzibalefofavan.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/ggEpja3/battery_operated_candles_coupon_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471992/normal_60321fd4b7caf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_fc86d6968df24d7f802fdb5618281216.pdf?index=trueIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_52ceb44e613949e48da9a7c87f6014c2.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001197c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197C 5520 bytes
SHA-256: 64ba41c8d69145f8207fb1850ed6d0c97c8f77c16ef5503fba8211049f5b43f4
font_01_sfnt_off00012c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 2660 bytes
SHA-256: 272fe8a07ae4d23fa398270c912f07121c050c7316157885759f2d16b12003d2
font_02_sfnt_off000137c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C6 11928 bytes
SHA-256: d456c25301e8278d23cd6d1eb8223b28b8c6f101ad31cfa3c15c7c79ae45f702
font_03_sfnt_off0001600d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1600D 16320 bytes
SHA-256: 04b30c2f2a8018c7583bcbc57b73eccbfb80cfa1e5a2d096ee4f0652c1212bf0

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