Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32e53e99c49d088…

MALICIOUS

PDF

76.7 KB Created: 2021-03-31 05:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9397bb8d7f392fdd51c0e7badf5038bf SHA-1: 53b59bff0024f0b6d9d2147da02e94bc39d03690 SHA-256: a32e53e99c49d08899ae05a5448af17e0d4b226d9778af009d02ddd527567abc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/award?keyword=solving+quadratic+equations+with+answers+pdf PDF link annotation
    • https://menafemudiwifog.weebly.com/uploads/1/3/0/8/130813668/miduniroruduko.pdfIn PDF document text
    • https://zisinifaja.weebly.com/uploads/1/3/4/5/134599776/wodemopesemaloboniru.pdfIn PDF document text
    • http://itanah.space/vinobatutajazusjp0h2.pdfIn PDF document text
    • http://skidki-day.shop/faledexeh6n4d.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/IgcTjav/stickman_football_2018_mod_apk.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/49277806205bz8gw.pdfIn PDF document text
    • http://theraisins.pro/88467457548pkir7.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/5eihPBK/fezunekunazilokitome.pdfIn PDF document text
    • https://kuvixajixi.weebly.com/uploads/1/3/1/6/131637850/cabfb708c871.pdfIn PDF document text
    • https://lusebedadejaxid.weebly.com/uploads/1/3/1/4/131407110/a4d4f7480a60cad.pdfIn PDF document text
    • http://govnosiakxws.online/kumituvurui9b72.pdfIn PDF document text
    • https://zifokodogip.weebly.com/uploads/1/3/1/3/131398222/mesigej.pdfIn PDF document text
    • http://trylait.club/529064118381j62g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_c4559b52dac046a78ce1481ef01f453c.pdf?index=trueIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_81eb12502d8b460792d6f8c819fbd456.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0194770f-b724-4b1f-bec7-1126eab49bad/xitatujizefetifegal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2240c499-e803-4f63-b3b9-a7d3317121b3/xivipigasenidixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e7071d-a857-4dd6-926f-dd4214383ae5/38359696402.pdfIn PDF document text
    • https://ee6e56e8-c390-49d2-810b-d4defef8b9c1.filesusr.com/ugd/eda187_876ab33bf38a4fcdbcd12d8a36552df1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 5796 bytes
SHA-256: 7538453f45d50c4bf151cfc85eeae2ebedd06e44657703ab4dbe19b96406255d
font_01_sfnt_off0000ff60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 11224 bytes
SHA-256: bb588edc86e51a14502b5efe9f666ca361028e0b60e50bab27bde5ea9e7b7318

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