Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d1251ccb83b3e4…

MALICIOUS

PDF

78.9 KB Created: 2021-02-06 04:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c8514dcf90f4ba2da0b7b8d684ac8f61 SHA-1: e86346995bf7fd922f3624cda95ed251c0463247 SHA-256: 58d1251ccb83b3e46cc93c3c1ff5e2005ef552a8dcd3db4fa4d7989ca17584fb
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and Weebly subdomains, indicating a link farm. One critical heuristic identified links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=calvary+church+souderton+pa+facebook In PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/16cf87e118fe4d5.pdfIn PDF document text
    • http://fitness-ital.fun/5998244101481k4y.pdfIn PDF document text
    • https://dalupapixoriwu.weebly.com/uploads/1/3/1/4/131438121/312f48913.pdfIn PDF document text
    • http://epaytds.xyz/205686684108evr5.pdfIn PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/vinapodutizinurab.pdfIn PDF document text
    • https://jajelawipazug.weebly.com/uploads/1/3/0/7/130739535/4683908.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/4742510.pdfIn PDF document text
    • http://mediaverifiedbadge.com/monster_rancher_2_gba_guide66fio.pdfIn PDF document text
    • https://seporarutigofu.weebly.com/uploads/1/3/2/7/132741198/4009594.pdfIn PDF document text
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/liwabivujotopojek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_60175e4ec2bad.pdfIn PDF document text
    • http://tehnotop.store/zaxufimogetegooxpdw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xetoluwe.epizy.com/que_son_antibioticos.pdfIn PDF document text
    • http://sezulezaba.rf.gd/an_inspector_calls_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/60858785197.pdfIn PDF document text
    • http://jupagezasolax.rf.gd/supernatural_episode_guide_season_14.pdfIn PDF document text
    • http://mamisiz.rf.gd/cltd_exam_content_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/xanelir.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
    • 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_off0000d308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 5464 bytes
SHA-256: aa0313a1514eb1662fed13dd43e3196dc5fd6a51924db8b658d6be15a73b9cc6
font_01_sfnt_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 11792 bytes
SHA-256: e3c79753898e75864054889f69d6d6105cf981841c05cc901f0fc972c864e8ae
font_02_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00011f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F86 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3