Malicious PDF — malware analysis report

Static analysis result for SHA-256 448e75fa17fa34cc…

MALICIOUS

PDF

80.0 KB Created: 2021-03-29 14:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 826255b0a98babb564143e205d11df5e SHA-1: b10fa7aee07b6be5e4397cc0e7af2f3c9727fdfa SHA-256: 448e75fa17fa34cc89aa6c158b9cc2fe4197e6a2d9251d78f9f9b9db827b9bcf
186 Risk Score

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 0.9993

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=cambridge+key+english+test+pdf PDF link annotation
    • http://edalovert.xyz/jedivexibugajiviti9dg2k.pdfIn PDF document text
    • http://rimka.xyz/bedolasumekekizeliiy8lx.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/zidFEib/download_game_tug_table_mod_apk.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/xexitadumoborajuzope.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/hAbT2gg/nissan_gtr_logo_hd_wallpaper_download.pdfIn PDF document text
    • http://airned.ru/dometic_air_conditioner_b3200_shroudwz5yf.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/wizard_sewing_machine_belt.pdfIn PDF document text
    • http://srakan.space/torufejofewm75z.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/what_is_the_best_griddle_for_a_glass_stove_top.pdfIn PDF document text
    • http://fresh-ita.space/why_is_my_roomba_not_connecting_to_wifiwr2d4.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/hgjIJQi/how_to_disable_adblock_in_chrome_android.pdfIn PDF document text
    • http://wusator.mygamesonline.org/susogisuzowijine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/64363321878.pdfIn PDF document text
    • https://0fecb50d-c8db-4b5c-a67e-01a13b1c0e9a.filesusr.com/ugd/da7c2d_56bab4939b4c4951916a183527f50a42.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_e7e40725e4a847db8ef903a81ff5f576.pdf?index=trueIn PDF document text
    • https://203e60c5-e32a-4587-ab6d-31d66de6d5b9.filesusr.com/ugd/014c36_b09f142942b04c309488c43f8c41014e.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_a1b919dd03cf400b88450f5e22e78e45.pdf?index=trueIn PDF document text
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_a2de86ffbb3e491fb32c75f9437fec33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/jabakakokufid.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_e87ae9d06ac3431b992df984347ab4f6.pdf?index=trueIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_4905995dfabd4712b4ccfbacf3676d39.pdf?index=trueIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_7f762f9533fe4fe6851f83f26a8f6eab.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_a11a36384a144cbd9ddbec3676493e2d.pdf?index=trueIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_75b57d1c93df434798c9240bc3330b88.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_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 5668 bytes
SHA-256: f1f05cf74f4996f22ef1bead44d1983d3216d81d9d8222f8195433e5b4e57ab9
font_01_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 12756 bytes
SHA-256: bfd0832be4e443ffc8ba0dfea9369b1d57a11a8142e724726de369be6e9df232