Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d36fc8e0150fe95…

MALICIOUS

PDF

77.4 KB Created: 2021-06-01 21:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05dea5a172a6f0441f36705c2864b0bf SHA-1: e884d8d21ed121f3acc03b9267a15322d269bd73 SHA-256: 2d36fc8e0150fe954aeeeb87b780f2ca2f6aa2c84c08415a9cb2820584bd49ca
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be related to a worksheet, which is likely a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/pbw?utm_term=multiple+alleles+human+blood+type+worksheet+answers PDF link annotation
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/xevavuxelafi-feleliwuxizu.pdfIn PDF document text
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/83a87d.pdfIn PDF document text
    • https://dununatanag.weebly.com/uploads/1/3/0/7/130775655/xibid-tisov-lovorinuroso.pdfIn PDF document text
    • https://kojelokawuzu.weebly.com/uploads/1/3/4/3/134341929/jozatibixusot_rigor_manupeguxu_kavin.pdfIn PDF document text
    • https://gasibikame.weebly.com/uploads/1/3/2/8/132814219/javuramabukeluzunef.pdfIn PDF document text
    • https://bujupejokoluga.weebly.com/uploads/1/3/4/5/134576849/kikifiguxatu_foluwefivebasag.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/030cb.pdfIn PDF document text
    • https://jubiporosevuzu.weebly.com/uploads/1/3/2/6/132695682/vupuvedijibume.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/xagowajizafos_dagemanokuwikar.pdfIn PDF document text
    • https://datezovog.weebly.com/uploads/1/3/0/7/130776229/fefozizodozopar-silinapete-sedakamurigak.pdfIn PDF document text
    • https://mebawepuxir.weebly.com/uploads/1/3/4/5/134525212/a2d1d.pdfIn PDF document text
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/xodezuwur.pdfIn PDF document text
    • https://tutonaxubetu.weebly.com/uploads/1/3/5/2/135296536/mesogazekovimix_kutaporeboxukuj_virikipurimisu_getekozamineb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144423117/79435374831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144f9a26-f188-4150-9841-fbc3966fa56b/modern_auditing_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b08ba3-8d77-4b50-ac9e-37907e1ee8b1/lagomakalaziperurenalag.pdfIn PDF document text
    • http://zexowisam.pbworks.com/f/9_snf_almanca_kitab_cevap_anahtar.pdfIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/144416427/kifababivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb7bba30-a503-4786-8f35-c15f5b4534de/rufesoboxe.pdfIn PDF document text
    • http://sokulus.pbworks.com/w/file/fetch/144467295/62459823403.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144441552/skam_noruega_temporada_4_capitulo_8_sub_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b4ed918-881d-4891-97c0-a302c68d83f2/sipevuxumufasakogugokunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35fcbcec-0fd6-414b-94cf-667909c4d368/how_to_critique_a_play_script.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144426501/classic_bomberman_hack_apk.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144449727/top_video_chat_app_with_strangers.pdfIn PDF document text
    • http://wotasaful.pbworks.com/w/file/fetch/144456519/73809909681.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_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 5604 bytes
SHA-256: 3c9f0882d89818728bcb23d768c190f630b575610d588db646e2d9d814206890
font_01_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 11316 bytes
SHA-256: 957c3a769c5eceafc06601ef0ec9cf8913f67d674e87ebeee3109be773b5e7d7

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