Malicious PDF — malware analysis report

Static analysis result for SHA-256 21aacbfe1a0115fe…

MALICIOUS

PDF

80.6 KB Created: 2021-03-30 13:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 66b9b2e4332d7e78ab3f35791f62594c SHA-1: d7a79cd415a730e534ef94bcac0a95c1d14e3edf SHA-256: 21aacbfe1a0115fe69315950eec0d189055f1e11e5d93fb5d5ad7a2e5a1162b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9964

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.
  • 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://golowaki.ru/strik?utm_term=the+duchess+of+malfi+character+sketch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409627/normal_5fd3417841612.pdfIn PDF document text
    • https://fofodivadi.weebly.com/uploads/1/3/4/8/134895081/9165744.pdfIn PDF document text
    • http://opt05.ru/constellation_map_northern_hemisphereybtkd.pdfIn PDF document text
    • http://lusolakidareve.mywebcommunity.org/jabegibejov.pdfIn PDF document text
    • http://dontbeshy.xyz/kenmore_he2_error_code_f218htl9.pdfIn PDF document text
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/pixaj.pdfIn PDF document text
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/5209253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_6036189c8a985.pdfIn PDF document text
    • http://murimubijejaba.mygamesonline.org/14541269007.pdfIn PDF document text
    • https://fidumozif.weebly.com/uploads/1/3/4/7/134715024/4064863.pdfIn PDF document text
    • http://acgmgroup.ru/fegijepumwj7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480393/normal_5fc70ef63c54a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471945/normal_603bab1acf7bf.pdfIn PDF document text
    • http://fherixq.com/how_much_does_a_10kw_generator_costr7hts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472501/normal_6046b47d3fcdb.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/togomoxasuxu_jikowesazegaduf_vewedesabitut_datobafokuzej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_af171a646dd34ca3988bd5aa1edb6552.pdf?index=trueIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_f7c2dc722d6746d983184a346bd97553.pdf?index=trueIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_96a35dff322b476b82b6b78dfc021bef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zowibatev/44115834750.pdfIn PDF document text
    • https://041bbef9-4dd1-43b9-9ec7-2672afc16ec1.filesusr.com/ugd/686814_dbd66df61fff4ee8a7fdd42952678591.pdf?index=trueIn PDF document text
    • http://rodisasedozax.myartsonline.com/tetafom.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/assamese_song_free_video.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_c4717da757844c5ea80ae865d1ff526d.pdf?index=trueIn PDF document text
    • http://bolirazebaf.myartsonline.com/jozujigotarakomi.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/crossfit_gym_wear.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/cardboard_toy_car_template.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_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 5276 bytes
SHA-256: d6cc712eacbcc59d93374a398eb198fc35e1355541782751f4536973817f2913
font_01_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 11356 bytes
SHA-256: 2e422dd759e714ff986e6600a935ce631859ebfa42b2367b183ebff9048cfe36