Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bb7924543af4a4…

MALICIOUS

PDF

79.0 KB Created: 2021-04-03 23:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 199f2250e649430b7fd240582f29be58 SHA-1: d4f0912269ac2f338f8777b26f2acaf568aef801 SHA-256: 71bb7924543af4a4ce0358f728d380c5505207f4fa82209d211e766f506381e0
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO spam operation. The primary URL, https://mezovuduw.ru/award?keyword=how+to+ensure+validity+and+reliability+in+quantitative+research+pdf, is likely used to direct users to a malicious or spam-hosting website. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, possibly to distribute further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/award?keyword=how+to+ensure+validity+and+reliability+in+quantitative+research+pdf
    • https://rusijarumeza.weebly.com/uploads/1/3/1/8/131871651/5533595.pdf
    • https://fibusiwuso.weebly.com/uploads/1/3/4/5/134510481/ratogepe.pdf
    • http://wewowajawa.22web.org/paxonodifodovozu.pdf
    • https://cdn.sqhk.co/muligumixe/rhjjcgj/70454008770.pdf
    • https://tufafoselebore.weebly.com/uploads/1/3/5/3/135389740/dotugapot.pdf
    • http://sudakomazagupa.22web.org/jakasibemisebarufisibudad.pdf
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdf
    • https://cdn.sqhk.co/pozedezupase/jfid6jf/stacker_arcade_game_unblocked.pdf
    • https://likifovufuli.weebly.com/uploads/1/3/4/5/134588617/3946170.pdf
    • https://javagakikidubat.weebly.com/uploads/1/3/0/9/130969576/6436784.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tojazudibumogab/lugaje.pdf
    • https://uploads.strikinglycdn.com/files/4dcc1b09-4c77-4249-b4bc-c167479e3e37/29509286780.pdf
    • https://uploads.strikinglycdn.com/files/c30bf6ab-a90a-4d3f-b049-511b9c18cde0/will_there_be_a_captain_underpants_movie_two.pdf
    • https://uploads.strikinglycdn.com/files/ac3b9711-7a73-490b-a0c6-1d4081f89b11/fifty_shades_freed_full_movie_download_in_dual_audio_filmywap.pdf
    • https://uploads.strikinglycdn.com/files/f2075592-d6d9-4ea1-9294-8864c5745116/boy_scout_canoeing_merit_badge_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/cf5b6f50-433e-4f49-8f1c-ec22503be734/44169482890.pdf
    • https://s3.amazonaws.com/kegovev/queen_of_mean_piano_sheet.pdf
    • https://s3.amazonaws.com/dobikasukavu/biased_news_reporting.pdf
    • http://lokemuwebofeg.rf.gd/9129037447.pdf
    • https://uploads.strikinglycdn.com/files/5be970b5-a077-462d-96fc-18776458fe86/lazuw.pdf
    • http://pobevezegudam.epizy.com/pufatopugubimu.pdf
    • https://s3.amazonaws.com/sevoga/law_of_torts_r.k._bangia.pdf
    • https://uploads.strikinglycdn.com/files/60ef4e0f-b5fa-45da-b85c-c5a9bdcda00d/79972790537.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_off0000e971.bin
d8be859311daee3753140809f4952f093bdde553c570fb16eadb8c8174b6eed1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 5604 bytes
font_01_sfnt_off0000fc87.bin
3ce93b61a406888d8cbca074f0eb0459bd722879dc777073ac05eba069e7830a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 10260 bytes
font_02_sfnt_off00011f97.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 4324 bytes