Malicious PDF — malware analysis report

Static analysis result for SHA-256 756f2d8f37bd6917…

MALICIOUS

PDF

77.8 KB Created: 2021-02-05 11:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d5b1e13948436253624b23257b0a6b1d SHA-1: 56ee0d109a8dbd3e8479a84dee93589fa14831bd SHA-256: 756f2d8f37bd6917c117a167e1521425f284f0db1cb9bff350816c8fcc491b8d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with one prominent link pointing to 'https://bologen.ru/wb?keyword=comparison%20and%20contrast%20worksheet%20grade%205', suggesting a lure to a malicious site. The presence of numerous other PDF links further supports a link farm or redirection strategy. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/wb?keyword=comparison%20and%20contrast%20worksheet%20grade%205 PDF link annotation
    • https://cdn.sqhk.co/zubavagi/WhdhojD/65733779128.pdfIn PDF document text
    • https://cdn.sqhk.co/polopomoset/1dhihaG/47453349363.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/hhhcskJ/super_mario_rpg_super_suit_cheat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389804/normal_5fc70ea8945bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459185/normal_600da85928930.pdfIn PDF document text
    • https://cdn.sqhk.co/roduxokixuzi/5iEljbO/color_run_fundraiser_for_schools.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogusobade/ibpkQhi/power_rangers_super_ninja_steel_evil_tommy.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/ihgd5jg/film_zombie_world_war_z_2.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/U1Rjdgh/63238619070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467300/normal_5fe372b60509d.pdfIn PDF document text
    • https://lopowizuxo.weebly.com/uploads/1/3/4/4/134438001/b21d48fdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404121/normal_5fe9fdbcc045e.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/hciijb8/dune_book_2_review.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/natewared/tinaretarufilukimix.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/24151602782.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/44710915290.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAB 6476 bytes
SHA-256: 28377de37417622fe424cd3b8e51b1abe900b2e6de3c4c6c944bb3914bc3840b
font_01_sfnt_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 5640 bytes
SHA-256: f61aa3c41025b2c9e745c9e6735b4ba4029dd22576135e9ef1c0212b9fedc5d5
font_02_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 10816 bytes
SHA-256: bf0cb3070baa918ef3aef05a6df233c8dd680d37f9fd32df8ddf95ec466cc7a0
font_03_sfnt_off000112bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 16488 bytes
SHA-256: e1e611b3f251a8becdb5719f31d8ee8952b71163df9724990285ffc355edc30a

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