Malicious PDF — malware analysis report

Static analysis result for SHA-256 1520d79129ff1bb7…

MALICIOUS

PDF

81.4 KB Created: 2021-03-27 15:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f86e64f9616bad0ed46e840f0b721de SHA-1: 938992a0fe9de884fa0b0ba8fa060640faa3bb48 SHA-256: 1520d79129ff1bb7cfde1fb78b1df8f9802108cf12facba074fbdbed9c834dc5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://nipisod.ru/wix?keyword=naxx+40+guide', is directly embedded and likely serves as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=naxx+40+guide
    • https://tirawinuzupufe.weebly.com/uploads/1/3/4/4/134445233/4d40fdfef2e3f3f.pdf
    • http://dorightschool.com/recibo_de_arrendamientoqqs92.pdf
    • http://kikababono.mywebcommunity.org/todasud.pdf
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/1666484.pdf
    • http://lnstagram-blue-ticks.com/kijazumopezutefixin120f.pdf
    • http://jirenaxapibetig.scienceontheweb.net/why_is_my_comcast_remote_not_changing_channels.pdf
    • http://nofovukad.iblogger.org/56948166166.pdf
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/suripizabokod.pdf
    • https://pofifeluvoka.weebly.com/uploads/1/3/0/7/130739131/lilereliwelegal_xafozep_kosulageba_duvaminufalug.pdf
    • http://tekupugu.sportsontheweb.net/bsc_magazine_september_2020.pdf
    • https://mufepubawitig.weebly.com/uploads/1/3/4/6/134614790/3526623.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_79c412fc37004bf59633076d9867b88e.pdf?index=true
    • http://rozipiliwune.epizy.com/chute_de_tension_electrique.pdf
    • http://tiluxusimutine.atwebpages.com/rainbow_magic_book_series.pdf
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_eca53311b92d4c6e8e5d03eee94b83db.pdf?index=true
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_1222a8af1ba24f689fad2868c008f71f.pdf?index=true
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_7f019d56389c43cd90727fee9d74fc19.pdf?index=true
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_988a73adeee14c87acc6fe7590a149a3.pdf?index=true
    • http://fawamoru.rf.gd/33649123170.pdf
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_af26bb95b16b4ae194f851ea1a2f72f0.pdf?index=true
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_aa71312f22cd4d3e9f1713ad34209943.pdf?index=true
    • http://jepugati.epizy.com/mokipofofiji.pdf
    • http://pamikope.epizy.com/b_scan_ultrasonography_of_eye.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d3.bin
7dc516d02e857156c55d77aa1f1c778a3deef255f450668f56a41c4e1d2661e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 4540 bytes
font_01_sfnt_off0001034c.bin
65875d306ad1569bd62bba90128d0b3c7042db3df335508b4049f988c296b2d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 11068 bytes
font_02_sfnt_off000128e4.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E4 4324 bytes

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